Fuel Pump

[celeryman22]

Hi, I've replaced my fuel pump with an Edelbrock pump. It have only two threaded connections. In from tank out to carb. Our vettes have a vent return line that I believe was from the pump. Do I need this anymore? How is this going to work now?


Thanks
Mike

 

[Vettehead Mikey]

How is this going to work now?

Very poorly. Ditch the bubba pump and get the correct GM part. Racing Catalogue fuel pumps do not make cars go faster.

 

[yellow77]

Wow, Mikey, that was a bit abrupt. I am in a similar position as I am about to install an electric fuel pump single inlet and outlet because the stock pump is a little light for the demands of the nitrous system (total hp in the order of 450). I also was wondering what to do with the vent line. On my 72 truck, it just ended up being plugged with a bolt and hose clamp and provided many happy years of operation. Just make sure you are running a vented gas cap so you dont collapse the fuel tank as it empties.


Cheers

Richard

 

[celeryman22]

Ok, I will keep it. I should probably still run the second line anyways correct?

 

[yellow77]

Celeryman, are you running all new lines? If so, then I wouldnt bother running the vent line. If you do, you will still need to plug it.

Cheers

Richard

 

[Vettehead Mikey]

Wow, Mikey, that was a bit abrupt. I am in a similar position as I am about to install an electric fuel pump single inlet and outlet because the stock pump is a little light for the demands of the nitrous system (total hp in the order of 450). I also was wondering what to do with the vent line. On my 72 truck, it just ended up being plugged with a bolt and hose clamp and provided many happy years of operation. Just make sure you are running a vented gas cap so you dont collapse the fuel tank as it empties.


Cheers

Richard

Sorry if it appeared to be abrupt, but the point I was making is still true. You do NOT need an aftermarket pump (of any type) for a street car. If you want one to look cool that's OK, but to put one on because Jegs or Summit says you need one is BS. L-88s (putting out far more HP than your motor) came with a AC Delco mechanical pump and worked and raced just fine.

Short circuiting a fuel vent line or re-engineering a fuel system underneath a shade tree is Bubba to me. That's just inducing a problem where none existed before. Sorry if that still comes across as abrupt.

 

[yellow77]

Mikey, thats ok, I agree with your point of view regarding the stock pump. The biggest reason for not using the mechanical pump was to eliminate the pulsations found in the fuel line which has more effect on the nitrous system. Actually, the stock fuel pump is by far the cheapest route.
And, voicing our many and varied opinions is part of the fun of these web sites.

Cheers

Richard

 

[celeryman22]

I appreciate everyones input. What is the main purpose of the vent line, vent the tank? (but from where seems odd to have a line run to the front just to vent the tank). Would the tank not vent through the vapour canistor, or does the vacuum from the intake manfold pull the vapor to the canistor? Is the fuel pump a pain to remove when its on the frame?


Thanks
Mike

 

[Vettehead Mikey]

ooops, wrong terminology on my part. It's not a vent line, it's a return line. It simply bypasses excess fuel from the pump back to the tank. The pump always delivers a higher volume than the engine needs.