Mechanical fuel pumps

[DavesJimmy]

My 76 GMC's mechanical fuel pump has 3 lines attached to it.. i have an edlelbrock mechanical fuel pump i want to install but it only has 2 connections? Do I just delete one of the lines and cap it? Or will the edlelbrock just not work period? Thanks for the info..

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[1987 GMC Jimmy]

The extra is the return line. You can cap off the line and the port on the pump, but if it were me, mechanical pumps are so cheap that I’d just get the three port unit.

 

[yevgenievich]

Third line i believe is return. At least it acts as such on my 85. Should be able to cap it

 

[Rusty Nail]

Don't cap the return line dude....buy a three port pump.

 

[Honky Kong jr]

Don't cap the return line dude....buy a three port pump.

Especially if he’s running an Eddy carb too. They are fussy with over pressuring them, I wanna say steady 6-6.5 is their happy spot.

 

[yevgenievich]

Actually overpressure is a good point. Apperently most recent aftermarket fuel pumps appear to put out over 10psi. Not sure on edelbrock pump exactly but I ran them on two vehicles with no issues at the time

 

[Craig 85]

If you run a 2 port pump, you could run this fuel filter. It has a return. Wix #33041.

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[DavesJimmy]

Thanks for the info guys... I'm wondering if fuel pressure is why it dies out when i slam on the gas. Its a new crate 350, timings set, carbs tuned, no vacuum leaks.. so o was gonna try a new guel pump..im stumped. I havent checked fuel pressure.. hmmmm

 

[Snoots]

Just what make and kind of carb(s) do you have?

Quick 'throw yer head into the windshield' stops could be one of 2 tings.

Desperate stops can contribute to emptying the fuel bowl which would: starve the engine or, flood the engine.

 

[DavesJimmy]

Just what make and kind of carb(s) do you have?

Quick 'throw yer head into the windshield' stops could be one of 2 tings.

Desperate stops can contribute to emptying the fuel bowl which would: starve the engine or, flood the engine.

Its an edlelbrock avs thunder series there 4x4 model.

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[Honky Kong jr]

Thanks for the info guys... I'm wondering if fuel pressure is why it dies out when i slam on the gas. Its a new crate 350, timings set, carbs tuned, no vacuum leaks.. so o was gonna try a new guel pump..im stumped. I havent checked fuel pressure.. hmmmm

It’s an Eddy thing easy fix is put a Holley on it lol I know I’m gonna get **** for saying that. Lol Easy Curt it’s a joke then again in my eyes it ain’t.

 

[Snoots]

It’s an Eddy thing easy fix is put a Holley on it lol I know I’m gonna get **** for saying that. Lol Easy Curt it’s a joke then again in my eyes it ain’t.

That explains a lot.
Had my problems with Holley too. That's why I love my Q-Jets. Har, har, hardy har har.

 

[Honky Kong jr]

That explains a lot.
Had my problems with Holley too. That's why I love my Q-Jets. Har, har, hardy har har.

Slobberjet to the rescue, I think not. Lol

 

[Rusty Nail]

If you run a 2 port pump, you could run this fuel filter. It has a return. Wix #33041.

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Never seen that before. Looks like it may be handy for something...sometime....maybe.
Thanks for the part # !

 

[DavesJimmy]

It’s an Eddy thing easy fix is put a Holley on it lol I know I’m gonna get **** for saying that. Lol Easy Curt it’s a joke then again in my eyes it ain’t.

Its hard to believe that a $430 carb would be that ****** right out the box :/ i guess i could try to throw a holly on there just to see if thats it.