ELECTRIC FUEL PUMP w/CARBS...

[VELOCITOY]

...What is the preffered pump...What do you do with the block mounted pumps???(empty..leave the diaphragms in???...WHAT??)...What PSI is utilized...Where to mount it ...I know that some pumps like to be "below" the gas tank to "push" the fuel, not "suck"/pump the fuel...That's tough in a boat!!!...I got the WIRING/RELAYS/etc COVERED...I just need to know EVERYTHING else!!!...lol...THANX...

[rob vaughn]

I have run a Holley, and a AC-DELCO pump, both did fine...

The Holley I ran a regulator to keep it between 4-8 pounds.... The good thing about at Delco was that I didn't need to have the regulator....

[sosmerc]

With carbs, I like the Holley Red and a Holley regulator set at 4 psi. I keep the engine fuel pump as well....install a diaphram service kit every year to keep the mechanical pump in good shape.
Mount the Holley low, and close to the fuel tank. You may want to put an inline filter between the pump and the tank and then a Racor water seperator filter between the electric pump and engine. this setup has always worked reliably for me.

[Raceman]

I agree with SOS on the Holley pumps and the 4 PSI. Getting up much higher, certainly in the 8 range and you're asking for blowing the needles off the seats.

One thing I'm curious about SOS. I read your recomendation on another thread recently about leaving the stock pump also. I'm curious why you prefer leaving it. Like you said, it's important to service it, making sure the diaphrams are in good shape. If you lose internal parts in the mechanical, the electric is gonna back pump through it and wet the motor down internally. If the electric fails, especially in the case of a Holley lockin' up, the manual's not gonna pull gas through it. I've always removed the stock pump when the electrics go on and have never had problems. It seems like the one time plugging of the vacuum source is a lot less trouble than worrying about the condition of the pump. I've always done it the same way on the old inlines when an electric was used.

[sosmerc]

I believe if the electric pump fails the mechanical pump can still pull enough fuel through the pump to run AT LOW SPEED. I have tested this, but not recently. So if Holley has made some kind of change to the design of their pump, I am not aware of it. I do run fuel pressure guages for both my low pressure electric pump and my high pressure engine pump. If I were to see fuel pressure drop on either I would throttle back and run at low speed until problem is resolved! Hasn't been an issue yet.

[sosmerc]

I forgot to mention, I see no problem if someone wants to remove the mechanical pump from the system and depend completely on the electric pump. That does eliminate the potential for flooding the engine through a broken or pin-holed diaphram. But since I service my mechanical pump every season I haven't experienced any problems....nor have I needed to break out the paddle yet either. (knock on wood):D

[Raceman]

SOS, I've never tried the mechanical with a failed electric to be honest. I guess I was just assumin', and we both know what that means. I did have some problems with an electric feeding a mechanical on one of my old 1500's. I've only had one Holley fail because of trash and it wasn't pre filtered, but that kind of thing and a long tow is somethin' you always remember.

[VELOCITOY]

THANX BOYZ...Any more answers, I'm all ears...(eyes???)...thanx...gotta love S & F...

[Jay Smith]

With SOS and Raceman, I use the Red holley with the holley regulator set @ 4 lbs at the carb. with the vacumn diaphram removed and holes plugged ! I like a fuel pump low as I can get it in proxcemimity to the tank also I ( My opinion again ) NEVER put any filter on the suction side of ANY pump. A pump is designed to push through a fuel filter not suck. I don't use water seperator filters either. I looked all over my trucks and cars and I am having a hell of a time finding one on them either so guess what, must not need it huh ????

LOL........................

[VELOCITOY]

A fuel filter is a must-have...If you use ONLY a water separator/filter aren't you covering BOTH bases...You're FILTERING & SEPERATING...& as that biatch Martha Stewart says: "That's a GOOD thing...!!!"...I ALSO see your point on locating it AFTER the pump, but can the pump get clogged???...Or am I being anal???

[Jay Smith]

Yea ya are.........

[VELOCITOY]

SEE...I'm not as dumb as I look!!!...hahaha.........

[Jay Smith]

" Don't worry bout the mule goin blind jus load da wagon and shake da lines "

" When ya live in Disney Land its a little hard to get excited when the circus comes to town"

Jay Smith

[VELOCITOY]

Didja ever wonder.........why you WONDER???...................Can God Himself make a rock so big.........that He Himself can't lift it???..................................Answer THAT smarty pants!!!...hahaha...

[Rickracer]

....I gotta disagree with no filter between the tank and pump. It does not have to be a really fine one though. Something like the screen in the tank will suffice, just enough to keep any "boulders" from getting caught in the vanes. Holley ships that type of filter/screen (inline) with some of their pumps, and won't warranty them if it wasn't used, or you can get them from Summit or Jegs. They won't really need to be changed, just blown out now and then, unless you pick up some real funk in them :cool:

[rob vaughn]

Some do it one way and some do it the other.....


I say "TWOMATO" and you say "TAMATO"!!!! And it's spelled tomato!!!!!:D
Go figure, the Laser of (POP-O_826)has the fuel/water seperator, and I run just a filter!!!!!!

[Rickracer]

By Jay Smith:
I looked all over my trucks and cars and I am having a hell of a time finding one on them either so guess what, must not need it huh ???? Virtually all cars have some sort of "screen" or "sock" type filter, either on the bottom of the fuel pickup (carb/mechanical pump) or at the bottom of the fuel pump itself (EFI/intank pump). I would not run a Holley pump without one. BUT , if you run a fine filter instead of a screen type between the pump and the tank, you most assuredly will starve your motor for fuel at some point in time, as soon as you pick up some trash or Fuller's earth or whatever, and stop up that fine filter.

[Techno]

All pumps suck, the problem is the suction is limited to less than 14 psi and may aerate with this extreme vaccum. The pressure side is an unlimited pressure but suction can only be ambiat air pressure. I think there is a limit but just what this limit is most aren't willing to chance.
I point out that most of these EFI engines are suction rigged not pressure systems. The pumps way up on the engine.