I just picked up another 86 z28 with some crappy aftermarket electric fuel pump putting out like 15 psi to the stock canadian m4med qjet :rollseyes: (no wonder he sold it runs like crap)

I want to run a low pressure carter electric pump by the motor with a mallory return style 4309 fuel pressure reg with the stock lines from the tank.

Is mounting the pump by the motor that bad of an IdeaÉ

Is the mallory regulator any goodÉ any better ones out thereÉ(return style)

Im assuming an 86 lg4 car just has a pickup in the tankÉ

 

Would the return line being 5/16 instead of 3/8 be a problem?

 

Where is the pump located?

Why not try running the 4309 with the current pump?

Can't say I'm all that impressed with Carter in-line pumps.

It's not the best idea. Pumps push better than they suck.

It's probably the best choice if you need a return-style reg. Most in-line pumps don't need a return and can be dead-headed with the less-expensive regs. But, a return helps reduce problems caused by hot fuel.

From the VIN? Don't assume, verify.

No.

 

The pumps right by the motor. Pressure varies between 9-15 psi according to a mr gasket gauge so who knows.

I don't want to run this pump its probably the cheapest crappiest one the p.o can find considering all the other things he did to the poor car. (pretty much "modified it" to the point of being undriveable)

What problems have you had with the carter pumps? I've def heard less problems with them than the holley blues.

I know pumps push fuel better than pull fuel but how much difference would it make if I mounted it where the current pump is in front of the engine? What are the drawbacks? Don't want to do a half effort job but I like it being within reach.
If not wheres the best place to mount a electric pump by the tank?

I've heard of problems caused by using a smaller return line with regulators. Stuff like spiking fuel pressure. Have you run a electric fuel pump with a return style regulator and a 5/16 return line?

I would verify but wont be able to throw the car on a lift for over a week. What should a 86 lg4 car have? Its got almost no miles so it should be stock.

 

An '86 LG4 should have a mechanical pump mounted on the engine, with a return line. Some had a dealer-installed kit that put an in-tank electric in as well if the owner complained about vapor lock.

Vapor lock is the main problem with having the pump in the engine compartment, doesn't matter if it's mechanical or electric. Having the pump in or back by the tank pretty much makes vapor lock impossible.

It's been awhile since I had a Carter in-line, so maybe they're doing better these days. Mine quit when the contacts corroded over. I've never used a Holley, but there are a bunch of them out there. The latest non-in-tank electric I had was Aeromotive, and I didn't have a lick of trouble with it.