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View Full Version : Fuel Delivery Prob..??



Ted Stryker
10-02-2006, 06:47 PM
My 1992 5.0 Silverado is acting a bit sick... It was running fine on the way to work this morning when it all the sudden stumbled and died at 50 mph... After the engine is shut off for a minute or so, it will crank and run again but not but for about 2-3 minutes before dying again... I immediatly thought is was the fuel pump because these trucks do have a bit of history with those puking, and because of the behavior of the crank and die - crank and die syndrome... After I got off of work I cranked it again and drove for about 10 miles before it suddenly died again, and I limped it home by letting sit a few minutes and recranking it several times... I didn't think it would go 10 miles if the pump was on the blink... I got home and pulled the supply side off of the fuel filter to see if the pump was pushing, but it doesn't when the key is just in the accessory position... If I try to crank it and stop, then I quickly drop down to look and see the tail end of some good flow but I don't know if it's continuous... At the moment I guess the pump is My main piont of suspicion, but is there any other explanation like maybe a computer issue... Thanks in advance...

JJB
10-02-2006, 10:27 PM
Ted,
I had a 92 Z71 5.7 litre and had a similar problem......Truck ran fine and then one day out of the blue every time you hit the gas it would just die down to a crawl. If you let the truck sit for a day it would drive okay for awhile and then after about 10 minutes would do the same thing. It started getting worse so I took it in to the Chevy dealer. They found out it was the fuel system and the bottle neck was the fuel filter...apparently I got some bad gas somewhere and when they took the filter off it looked like jelly comming out of it (they also had to drain the tank and flush the line). After flushing the system and replacing the fuel filter it ran like a new truck.

James

SportJ-US-1
10-02-2006, 10:42 PM
Yep, classic fuel filter problem.

Ted Stryker
10-03-2006, 07:24 PM
I bought a new filter today to change out for the heck of it, I'd better try that first before snatching the pump out I reckon... That for the replies Fella's...

Ted Stryker
10-07-2006, 10:11 AM
I put the new WIX filter in this morning, went out and the ran the hell out of it for about 15 minutes and all was just fine... Decided that it was OK and on the way home loafing along through My neighborhood at 10 mph it went dead as if I turned the key off... If I bump the starter over brielfy not intending to crank the engine and let the key back to the accessory position, I can hear the fuel pump but it's only for about 1-2 seconds before it goes silent... I think that they are suppose to run continuosly when the key in accessory, but I'm not sure... I'm just trying to make sure it's the pump before I take the bed off, thanks again...

CDave
10-07-2006, 08:33 PM
Sounds like the ignition module is going out.
If ya just turn the key on but don't crank it the fuel pump will run for a few seconds and then go quite, that's normal.

Ted Stryker
10-08-2006, 01:13 PM
Allrighty then, I put a new pump in the tank and the results are exactly the same... This time when it died and would not start I looked down in the Throttle body and the injectors aren't firing, wait a little while and they squirt and the engine will fire... Spray starter fluid on the butterflies and it will fire, I just don't know... Is there an injecter pump that control the cycle of the injecters, or is the computer going out... Actually it seems to run for very,very near the same duration of time from first start-up before dying with a seemingly consistant pattern...

1BadAction
10-09-2006, 02:57 PM
did you replace the fuel pump solonoid? sounds like the solonoid is going bad OR the connector on the solonoid harness is loose. I had to take the harness in the 94 apart last year and put new tight pins in it. worked like a champ since...

old school
10-10-2006, 01:17 PM
The Fuel pumps on GM, ford, chy vehicles only run for 2-3 seconds, then shut off, that is normal. They will also shut off if there is a loss of oil psi. There is a sensor in the fuel pump circuit that monitors oil psi...some sensors are all in one, so replacing the oil psi sensor .....that may be your problem.

Ted Stryker
10-10-2006, 04:57 PM
No I didn't replace the solenoid, just the pump motor only... All the wiring and connectors looked remarkably well, but I know that's no guarantee... As far as the oil psi shut-off sensor, I didn't know that it had one... If it's any consolation I have kept a direct eye on the gauges when it the engine goes kaput and everything still shows to be normal, but once again that's no guarantee... My Dad works at a very reputable Chevrolet dealership and relayed My issues to the Mechanics, and they seem to think it's the computer... They may just want to throw parts at it until something works...

1BadAction
10-10-2006, 05:04 PM
Kevin, find the pump solonoid and move it around with the truck running. if thats the problem it'll shut off like you turned the key.

old school
10-10-2006, 05:22 PM
Relays are very easy to test. Just swap the relay with another one, like the horn relay, or the ac relay and blow the horn. Most of the relays are the same, 4 or 5 pin relays will interchange. Or smell the relay in question, you'll know right away if it's burn up. There are no fuel pump solonoids, just a relay and a fuse. Intermittent problems are the toughest to find.

Ted Stryker
10-10-2006, 07:42 PM
I unplugged most everything that I could find in the upper engine area, nothing made a difference other than maybe a slight change in idle RPM... The ony thing that made it die was when I pulled the fuel pump fuse, yeah I know big surprise.. It seems to be able to idle all day long, but driving on the road is a different story... I'll get back on it tomorrow to try to narrow something down... Thanks again for the replies...

old school
10-10-2006, 08:23 PM
Maybe you misunderstood me, swap the fuel pump relay with another, and drive it. At least you'll know what is'ent the problem. And I wound not be pulling fuses and relays while the engine is running, you'll end up setting more codes. good luck.

1BadAction
10-11-2006, 07:38 AM
relay was what i meant :o

you'll have to excuse me I was on a 3 can red-bull bender at the time :rolleyes: LOL

Ted Stryker
10-11-2006, 03:52 PM
Old school, My last reply was delayed... The things that I did in My last post were done before you posted your 7:22 pm response.. Here in the next hour or so I'm gonna try a code key to see if anything useful comes up..

loop
10-14-2006, 06:29 AM
www.fullsizechevy.com
I've found some good info on TBI Chevys on their forum.
now,squint your eyes and imagine the boat in my avatar with a black trailer and a Merc....look familiar?:D

Ted Stryker
10-14-2006, 07:51 AM
Thanks for the link loop, I've got a new computer for the truck coming Tuesday... As for the XB in your avatar, let Me put it this way, I'd like to have another one...;)

loop
10-14-2006, 03:46 PM
I bought it from Donnie back in January. I was literally a weekend away from driving to Tennesee to buy one when I found this one only a few hours away

Ted Stryker
10-14-2006, 04:10 PM
It was 97 degrees outside with a box stock 260 Merc and a 27" SRX Bullet cut with a stripped load minus still having the trolling motor bracket on... I ran that boat 98 or 99 mph (radar) and still had a little bit left, and that was with minumal setup and no strategic weight distribution, just hop in and floor it due to time restraint (long lunch break)... The boat was starting to lift hard on the left side at about 93-94 mph and getting worse with more speed, We were time limited so We put it on the trailer... I also ran that boat 103 mph ( police radar) with the same basic set-up but with a slightly higher engine elevation and perfect water chop at Grand Bayou in Coushatta, La. at some races down there... It drives well also, I ran it to 90 mph in the first 2 miles that I drove it the 1st day that We had it on the water, and it would just sit up high, flat and dry like a Bass boat dream... That boat it surely a good runner, don't be scared to go toe to toe with any other true Basser... That hull probably had the "longest legs" of any other Bass boat that we've owned...

loop
10-15-2006, 06:37 AM
thats exactly the numbers Donnie told me.He said ya'll suspected the trolling motor was causing it to lift on the left side.
I'm nowhere near those speeds (yet)
Sounds like I need some setup work,more horsepower and bigger b@lls!

Ted Stryker
10-15-2006, 08:47 AM
Nah you don't need a bigger satchel, just keep it trimmed about neutral ( maybe a bump more) and let the hull do the work -- oh yeah, don't dive out of the gas... I've never had any of Our Allison's blow out, but I have washed a few decals by chopping the power to quick or accidentaly running up on some sneaky paralell boat wakes... A few long trim bumps down to let the length of the pad down to the water as your backing out of the throttle and it'll do just fine... In case you didn't already know this stuff, and think about it in your sleep like Me:D ...

live2ride31
10-18-2006, 03:00 AM
my buddys chevy 2500 just died on him the other day and it turned out to be his ignition coil. i replaced the plugs wires and coil and his truck is running better than it has in a long time. this might not have anything to do with your problem but if your truck hasnt had a tune up in a while it certainely wont hurt. ive had broken coils make some wierd problems for me in the past. sometimes theyll even test good on a meter but can still be bad.good luck with it............................................dave

Ted Stryker
10-18-2006, 03:34 PM
Yeah I still fear it could one on many small components, I think that one of the patterns sort of makes Me think or almost know that it only dies after it reaches full temp, My Mom's 1998 Z-28 was doing the exact same thing and it turned out to be the computer... The computer is "supposed" to be here hypothetically, theoretically today at 4:00 - 5:00 pm... I'll slam it in and post the results soon... Thanks...

live2ride31
10-19-2006, 03:43 AM
so whats the result? any luck?

Ted Stryker
10-19-2006, 07:52 PM
Just got the computer late today, I put it in about 30 minutes ago and it cranked right up but that doesn't mean much... Given My circumstance I can't take it out and put any miles on it tonight, but I plan to tomorrow..

The Big Al
10-19-2006, 07:57 PM
Ted, there is also a relay and the oil sending unit turns the pump on.

There is two system to run the pump.

One is time delayed when you crank the engine, then that system turns off and the oil sending unit keeps the pump running.

If the truck always cranks and runs then cuts off I would check the oil sending unit.

Fuel filter plays a big part this time of year with cold morning and warm days. Condensation build fast in fuel tanks.

Ted Stryker
10-21-2006, 02:46 PM
New computer didn't work, it's still doing the same thing... I'm suicidal, is that a normal emotion..?

old school
10-21-2006, 03:02 PM
Ted, Did you change out the Oil psi / fuel pump sensor that we suggested acouple of threads back?? And if there is no check eng. light, there are no DTC's set. The last item is the fuel pump itself, they do go bad. The bad news is you have to drop the tank to change it. You may want to take it to the dealer and save yourself the hassel. Your time is worth somthing too! A fuel pump runs around $100 bucks, labor will be around $160-170. If they can fix it, what ever the problem is, for under $300, you may want to consider it. But try the oil psi sender first. Good luck hunting.

Ted Stryker
10-21-2006, 03:19 PM
I changed the fuel pump last week, it was the second thing that got changed right after the fuel filter.. I've changed about 5 of them and taking the bed off is the easier way to do it for future reference... I'm gonna be looking for the oil pressure sending unit next, I don't know what else could cause the injectors to stop firing... I would think that it would be one of the last systems in place to kill the injectors... Thanks for the steady replies..

CDave
10-21-2006, 04:53 PM
Have you changed the ignition module yet?

FYI, the easiest way to change the fuel pump is to cut a hole in the bed. ;) :D

Ted Stryker
10-21-2006, 06:30 PM
No Dave I haven't changed the module yet, would that cause the injectors dry up the way that they're doing..? As far as the bed, maybe I shouldn't have necessarily said the "easiest"..:)

The Big Al
10-21-2006, 06:49 PM
it's mounted on the firewall by the wiper motor
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The Big Al
10-21-2006, 06:51 PM
They do not work well reused

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The Big Al
10-21-2006, 06:54 PM
Your engine might have 2 sending units (one with 2 terminals and one with 4 terminals), you need to change the 4 terminal one

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Ted Stryker
10-21-2006, 08:24 PM
Thanks Al, I have an O'reillys nearby that I may be able to get to tomorrow.. That's where My replacement pump came from..

CDave
10-22-2006, 10:06 AM
No Dave I haven't changed the module yet, would that cause the injectors dry up the way that they're doing..?

Don't know about that but your problem sounds alot like a bad module. Ya know the old saying, 90% of fuel problems are in the ignition. ;) :D

Ted Stryker
10-22-2006, 01:03 PM
Yeah, and 90% of those are a pain in My azz...

old school
10-22-2006, 02:12 PM
Well we all want to see ya finally nail it. You pay for an education, one way or another...

live2ride31
11-27-2006, 07:58 PM
did you ever get it fixed?

Ted Stryker
11-27-2006, 09:14 PM
I have an ignition module ordered that was supposed to be in about 2 weeks ago, since I haven't gotten the delivery call yet I have used that as a shallow excuse to not work on the blasted thing... To be direct, I haven't done a thing to it but move it out of the way of My daily activities... I know, I know I'm a lazy frustrated Bastard...

electricjohn
11-28-2006, 06:09 PM
IIRC, the oil pressure switch just backs up the fuel pump relay to keep you running if there was a fuel pump relay failure. They are wired in parrellel and would not shut the pump down on a loss of oil pressure unless the fuel pump relay failed too. Low oil pressure (<4psi) will not shut your engine down. Your pump runs for 2 seconds upon key-up, runs during crank, and will continue to run if your distributor gives an input ( engine running) pulse to the ECM. Check the fuel pressure on the rail during key-up with a pressure gauge at the shrader valve mounted on the rail. This will tell you if you have a bad fuel pressure regulator. You should get about 40 psi on the rail after key-up, then it will drop since the engine is not running. If you start the engine, it should stay at about 40.

Ted Stryker
11-28-2006, 06:59 PM
That's good to know... The fuel pump relay is good, but I don't have a fuel pressure gauge.. I'm thinking about just taking it to the local GM dealership where they have the equipment to assess these evil symptoms.. I'll check on a pressure tester, if there pretty cheap I'll pick one up and give it a whirl... Thanks for the input, I guess I'm becoming less of an idiot as the replies come in...

electricjohn
11-28-2006, 07:25 PM
Kev,
You can use a tire pressure gauge. Just use a rag too to contain any spray. On another note, you talked like the problem went away after 10 minutes or so then came back, and on and on. This sounds more like a loose electrical connection related to heat. Gets hot, engine dies, cools down, engine starts. If you have a distributor, check the electical plugs going to it, if they get loose, heat can be breaking your connection. One of these two plugs brings the +12 volts to the distributor. If you have coil packs than strike that last idea or check connections to your swichbox.

Ted Stryker
11-29-2006, 08:59 PM
Initially the time till stall was relatively consistant, but now I'm lucky to get 50' out of it before it dies.. Last week I decided to get it out from under My covered parking to make room for our operating vehicles, although it hadn't been cranked in a couple of weeks it died twice trying to get it to the next door driveway and it felt like the same kind of stalling as before and not just rigormortis... If I decide to blow it up, I'm gonna try to get My hands on one of the old 100 megaton Hydrogen bombs from the Cold War Soviet Union era and send everyone a free video of the "expansion"... You will all be invited to run some closed course boat races in the small lake that will be created, it's a win win for everyone...

Ted Stryker
12-03-2006, 07:02 PM
And the winner is (drum roll please) --- CDAVE... I put an ignition module in and wouldn't ya know the the mechanical azzhole cranked up and ran like a refugee... Thanks Fella's for all of ya'lls concern and recommendations, although it didn't need some of it to run again it sure needed alot of it as a tune-up so it wasn't all in vain... Thanks again everybody...... Hey CDave, what other sort of stuff do you give advice on..?