I am trying to find the fuel pump power wire in a 91 rs camaro. originally had a v6 injected and swapped it for a 350 carbed. when i swapped a carbed engine in my truck i just cut the fuel pump power and the mechcanical pump sucked through the electric pump pickup in the tank. not as much room under the camaro as the truck can't find the wires at all.

 

just pull the pump relay instead

 

Is that the one with the big orng wire on the driver side of fire wall perhaps ? was trying cant get it out. stubborn thing. PO had it sitting in his yard for 2 years so everything ether is rotted and crumbles or wont budge :P

 

You can do one of two things. the wire is at the fuse panel and it goes to a fuse labeled fp.

The thing that I did for my brothers car was we used the fuel pump in the car and put a regulator so the electric fuel pump supplied fuel and the regulator brought the pressure down to 6-9psi. Not only is it a clean install he can shut fuel off to the car whenever he wants.

 

how much would a regulator cost ? a new fuel tank system without the pump just a pickup line from autozone is $80 :/ thats why i just came back home and was ganna see if i could suck through the pump.

 

I think it was about the same. 70-80 from summit, a 3 port regulator, feed, return and another port for a fuel pressure gauge

 

well i looked for the fuel pump fuse again and cant find anything related to it... besides injectors a, injectors b. im looking at the fuse box under the steering wheel

EDIT- I will take a pick and show ya what i'm looking at.

 

glare is kinda bad, but don't see anything for fuelpump

 

Got a quick lil question for ya'll anyway, dont mean to steal ur thread buddy but since were on the topic i minus well ask it. i got a painless wiring harness in my 88 iroc and im going carb'd but the fuel pump relay is wired into the painless harness that i had my buddy install. how would i run the original wires for the relay on the driver side firewall?

 

Contrary to popular belief, the fuel pump fuse is not in the fuse box. Thank you, GM!
It is a separate fuse by the battery, attached to the fender. Looks like a dead connector. Has two wires: red and orange.
This fuse supplies power to the F/P and the ECM. If you don't want either, feel free to just remove the fuse.

Hope this helps.
Lou

 

Like Lou said, there is a fuse in the fenderwell behind the battery that controls the fuel pump - pull that fuse and the in tank pump will no longer run. The fuse panel fuses only run the injectors from the TBI unit.

The relay has nothing at all to do with your fuel pump now - since you swapped to a non-ecm carb setup. It can be removed with no effect.

The wires that connect to the fuse at the battery - one goes directly to the fusible link system, so it always has power, regardless of key. The other end runs through the Oil Pressure Sending Unit (OPSU) and directly to the fuel pump. Your OPSU is above your oil filter, there are 3 wires - 2 larger ones coming in/going out to fuel pump, the third smaller one sends info to your oil pressure guage.

Now - as far as regulators - you can get a Mallory 4309 for about $80 from Summit. This will allow you to use the in-tank pump. Or, you can try sucking fuel from a mechanical pump through the dead in-tank pump - but most won't do it from what I read. And, trying to suck the fuel through the dead in-tank pump with an external fuel pump will just kill the external pump sooner or later - everyone always tries, and everyone always fails.

So, you're left with either using the in-tank pump and the Mallory 4309 regulator (or similar RETURN-STYLE regulator from Summit, Barry Grant, and I think Holley has one), or dropping the tank and removing the in-tank pump and replacing with a carb pickup.