fuel pump hook up help please!

[willow72]

hey guys i just bought 72 truck it has a 330 hp vortec crate engine in it . it also has a670 holley projection fuel injection kit on it the problem is cant seem to get it to run right its got problems . so i have decided too try a demon carb on it so i want to put a mechanical fuel pump back on it the fuel i bought did not come with any instructions so i dont know which gas line goes where?the pump came from gm performance and is the same kind that comes on the 330 deluxe vortec crate motor so can anybody help me with this gas line hook up problem?

[rage'nrat638]

when mounted the one that points to the frame...goes to the tank
the one that has the thread or points forward goes to the carb....

[willow72]

but it has 3 places to hook up 3 lines is 1 a return line?

[J.Lance]

The spare port is a return line. A stock application for the year had no return line and only an inlet and outlet. You can either return the pump and get the correct one, plug the return line, or hook it up back to the tank. I'm assuming the PO had a return line with the ProJection setup but it is not really necessary with the carb.

Jason

[bpmcgee]

Willow,

It may be easier to simply use a fuel pressure regulator and the electric pump that's already installed.

Just my two cents, of course, but that's what I'll do if I get rid of my pro-jection system.

Brian

[willow72]

what kind of fuel pressure regulator?how much do they cost?

[tomsC10R]

I personally wouldn't use a fuel pressure regulator. My holley pump for my pro jection puts out over 45 psi. You'd have to lower it to around at least 10 psi for the carb. That would put way to much strain on the fuel pump -- it's suppose to be able to continuosly free flow fuel, hence the return line with the fuel injection. I wouldn't do it. Just my .02