Long story short I bought my corvette with an omega wrecked engine. That's fine, wanted to do a rebuild. So I bought an 86 350 block without support for a mechanical fuel pump (not purposely) and I'm having trouble trying to figure out how I should set up an electronic fuel pump. I know it should be very close to the tank (which I have out now). Could I stick an 82 in-tank pump on and use that? Is that pump even powerful enough? I'm looking to produce about 400-450 hp and I will be using around a 600-680 CFM Carb.

 

the 82 factory pump puts out 11 -14 psi. that's to much for a carb .you could use a regulator.

 

Regulator is OK with me.

 

How would I go about wiring the pump?

 

You would need to wire the pump through a relay so that the pump gets power in start and run.

 

check fuse box for a hot spot with the key on.If you wire direct you would need a on/off switch.

 

I wouldnt dead head that pump. Its got to have fuel moving to keep it cool. Add a regulator use your vent line goin to the tank as a return. Just my 2 cents..

 

Return line does sound better. I can do that. Where is the vent line located? is it the one going to the carbon container?

 

Leave the vent as it is. You will already have a return line. If you look where your mechanical pump was there should be two lines. The larger (1/2"?) Line is the supply, the smaller(3/8"?) Line is the return.

 

I agree..DO NOT USE your vent line on the LEFT side frame rail!!!!!

The supply line is 3/8"...and the return is 1/4"

I have done this and fabricated up a steel line that would go to the carburetor. The end of this steel line where it will attach to the rubber hose coming off your fuel line attached to the frame...I brazed on a male AN fitting

Now in this steel fuel line going to the carb...I drilled a very small hole and brazed on a steel tube that I also brazed a AN fitting to attach to it.

Now I used braided hose with the correct female AN fitting that would attach to my fittings I brazed on. The end of the hose that goes onto the factory steel lines....I use TWO hose clamps on the 3/8" hose due to being under pressure.

Rubber hose can be used if you choose due to it is rated to 50 psi. But I still prefer to use the AN fitting design instead of a hose clamps due to the supply line is under pressure.

I would also use TWO hose clamps at your sending unit....and also the rubber hose that comes off your sending unit going to the factory steel supply line.

I also usually change out the runner fuel lines back at the fuel tank due to IF I am adding a fuel pump in the tank (regardless of how low or high the fuel pump pressure is)....I do not need any surprises and I will use the newer bio fuel hose that is rated to 200+psi.

You MAY be surprised that WHEN and IF you do the fuel return...and install a fuel pressure gauge where you disconnect the fuel line AT the carburetor...that the fuel pressure may be just fine WITHOUT needing a regulator.

Keep in mind...I also CHECK the fuel return...and THAT is why when I drilled that small hole in the line...I can see the fuel coming back into the tank because I disconnected that hose and have it going into jug.

DUB

 

Yes not the charcoal line. I mis spoke. Its the line beside the main supply. Sorry... I always refered to that line as the vent for some reason... gettin old I guess

 

Okay sounds brilliant. I was already going to replace the rubber fuel lines as all the rubber on this vette is toast. It may be a while before I can do this mod, as I've halted progress due to title issues.