electric fuel pump recomendations for 200 hp merc carbed

[coffeeguy]

I have a 89 200 hp with wh46's . Have a Carter 4070 in the boat so about a 3 ft head , no return line . It gets 5 psi at idle but when over 300 psi drops to around 3psi and above 4000 the pressure gauge needle is all over moving wildly from just above 0 to just less then 3 psi. When I did a volume test it was putting out about 1/2-3/4 gal per minute. I am thinking I am running out for fuel up top. It will pull about 5500 . same combination would pull 6800 with a non-discript fuel pump , that didn't last long . I am thinking it can't keep up. Should I be looking at a Quick Fuel DFT 125 or Holley Blue ? Should I then run a return line. I am using a AEM regulator

[mercrazy]

Why do you need electric pump?

[skialot2]

Put the stock pulse pump back on it. It pumps plenty of fuel for that motor. Their is no performance advantage from removing the pulse pump.

[coffeeguy]

Front is 1980 225 and the pump is NLA

[mercrazy]

Just put a diaphragm kit in it.

[pkstv]

Holly red . No regulator should work just fine

[tlwjkw]

Put the stock pulse pump back on it. It pumps plenty of fuel for that motor. Their is no performance advantage from removing the pulse pump.

some (like me) are jus plain lazy....... :reddevil:

[pcrussell50]

Slight thread hi-jack…

I have the exact same motor as the OP: 1990 2.4/200, WH-46s, square style pulse pump. Had it for three years. Rebuilt the pulse pump three years ago when I got the motor simply because I didn’t know its status.

Question: How often should it be pulled apart for inspection and/or rebuild?

-Peter

[pcrussell50]

Duplicate deleted sorry

[coffeeguy]

1980/81 225hp is different and kit is nla

[mercrazy]

If it’s the figure 8 style, there a sierra kit on eBay.
https://www.ebay.com/itm/233596027385?_skw=mercury+outboard+fuel+pump+kit&epid=1143100874&itmmeta=01K4JTNJK8401X3QYA5HAWVFD4&hash=item36636881f9:g:UNMAAOSwsChex~KZ&itmprp=enc%3AAQAKAAABAFkggFvd1GGDu0w3yXCmi1dxD1dJwLewSqgG4LWFdwUQPI3QSfcCTbXtzLL7uLOhp6ugK92VrNArOW% 2F61VvW1bWy%2FrTqSnbqPtuvmFRduNcSyJ0YqzvCx0kRantzr3KYkPbKHo0uo6V1AXo81Hcb%2FlyeXpf4RushKg4OMecll8w%2 Fv23sgPc%2FPyJzPQBPSeyai5JXWVNGrJedFWvG7LwCRBD3l3Nq2nV8eHEIiWSxaCB%2Byl0y9VyRfnX7ma6PxxUp1Oi4IJ7dylI Eqw4fgU1PzotC3%2FXSSphGB6BOWukgVQawrhQHUHiWTjrV0IGROmwaADHGQ%2BbAsLPCg4aO%2BtBqndw%3D%7Ctkp%3ABk9SR_ Cp1tqkZg

[hydra-sports]

Holly red . No regulator should work just fine

I disagree. the holly without a regulator puts out 7psi, plus you will need a return line to tank otherwise the gas will overheat in the pump

[skialot2]

I disagree. the holly without a regulator puts out 7psi, plus you will need a return line to tank otherwise the gas will overheat in the pump

Holley red pump has been used for decades without a regulator. The pulse pump pushes higher pressure, I know I had a red pump for years without a regulator.

545122

[tlwjkw]

[QUOTE=skialot2;3454611]Holley red pump has been used for decades without a regulator. The pulse pump pushes higher pressure, I know I had a red pump for years without a regulator.QUOTE=skialot2;3454611]

agree... all i ran on 90% of all carb motors (both production and hi perf.) i've had in my possession for as long as i can remember.. no reg.. no return!... but thats jus me.

[pcrussell50]

Holley red pump has been used for decades without a regulator. The pulse pump pushes higher pressure, I know I had a red pump for years without a regulator.

Are you saying that you leave the pulse pump in place and just have the Holley red pump from the tank, to the pulse pump?

For now, I'm perfectly happy with my primer buib and pulse pump, but I'd still like to get this squared in my head in case plans change down the road.


-Peter

[skialot2]

Are you saying that you leave the pulse pump in place and just have the Holley red pump from the tank, to the pulse pump?

For now, I'm perfectly happy with my primer buib and pulse pump, but I'd still like to get this squared in my head in case plans change down the road.


-Peter

It has been a long time since I had an electric pump on an outboard. And I didn't install it. It came with the boat. So it's hard to remember. It was on my Bridgeport carb. But I don't believe it had the pulse pump. I think it was just the electric pump. The book says if you use an electric pump with the pulse pump it must be limited to 4 psi. Holley Red goes to 7psi. I would never put in an electric pump unless it called for it. The pulse pump is super reliable.

[David - WI]

My HST came with a Holley Red pump and a non-adjustable (probably 4 psi?) regulator on a carb 200... worked fine. Now with EFI I'm using the stock setup.

[tlwjkw]

both carb BP's and high performance oval port came with 'lectric only.. had brads/rivets in tha pluse port hole... no need ta leave a pluse pump on it when ya go to 'lectric.. i've run tha red on most every carb motor i've had from tha oval port to tha 245's with no regulator at all over tha years.. mainly cause i'm lazy and don't like ta squeeze tha bulb...................... :reddevil:

[coffeeguy]

I know these pumps rather push then pull fuel, my original tank has the fuel pick up coming out of the top. Will it be ok to mount it at floor level (still have a primer bulb between the tank and pump) so a little bit of suction is needed( about 12"? Its a QFT 125 I am putting in, with a return line. I had have a Carter 4070 but at WOT the pressure needle is a blur between 0 and 3 psi. I figure the return setup will give a steady pressure of my choosing.

[aj06bolt12r]

"I know these pumps rather push then pull fuel, my original tank has the fuel pick up coming out of the top. Will it be ok to mount it at floor level" Yes

"(still have a primer bulb between the tank and pump)" No need for the primer bulb

"Its a QFT 125 I am putting in, with a return line. I had have a Carter 4070 but at WOT the pressure needle is a blur between 0 and 3 psi. I figure the return setup will give a steady pressure of my choosing." Lots of dead head systems with no return out there that have been running fine for years, but yes, a return style regulator is better because it keeps the fuel circulating and keeps fuel and fuel pump temperatures down.

[Merc 2.5]

My holley red went down and i went to orileys and got a eldebrock fuel pump , says 5 to 7 lbs , regulator guage read 7lbs not holding anything back, I set it to 5.5-6lbs at idle and it's been doing great up to 7200 or little more , never starved. It's nice to not squeeze on primer bulb. Mines on a toggle with a relay and fuse. Been runnin this set up for last 10 yrs or so.

[tlwjkw]

It's nice to not squeeze on primer bulb. .

ha, ha... nice ta see i'm not tha only one..... :leaving: