Author Topic: Fiero fuel pump  (Read 410 times)

Ccemn1

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Re: Fiero fuel pump
« Reply #5 on: January 21, 2025, 07:53:24 PM »
Can anyone post me a photo of the relay, So I have an idea of what i'm looking for?
I'd really prefer to get this set up stock and proper.
Thanks in advance.

Neils88

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Re: Fiero fuel pump
« Reply #4 on: January 21, 2025, 05:24:32 PM »
Yes... the fuel pump is inside the tank. But if you do want to run it off a switch, you should still keep a relay inline. A low current switch would trigger the relay, which then runs the high(er) current pump. It's always the safest way to do it.

Ccemn1

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Re: Fiero fuel pump
« Reply #3 on: January 21, 2025, 09:27:46 AM »
Yes, the car is titled as a 1987 Pontiac Fiero, but has the 3.8 SC engine upgrade. It was my understanding, I believe I was told by another forum member, that the fuel pump is inside the top of the fuel tank? I'm hoping your info is correct, I'll have to get back to the garage and reexamine the engine compartment. If I can't come up with a determination, maybe I'll post some pictures, or a video, and maybe someone can help me identify the location of the fuel pump?
I'm only a mid-grade mechanic, and old. I can't thank you guys on here enough. I'd be completely lost without this site!
Sorry, in rereading your post, I see you were talking about the fuel pump relay. Back to my search and thank you.
« Last Edit: January 21, 2025, 09:30:22 AM by Ccemn1 »

Neils88

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Re: Fiero fuel pump
« Reply #2 on: January 20, 2025, 06:24:48 PM »
Is this a Fiero based car? The pump relay should be in the engine compartment, on the firewall, behind the driver. It usually doesn't get moved with the 3.8 swap.

The fuel pump is normally turned on when cranking the engine, and then kept on by the ECM while you have oil pressure. If you lose oil pressure, such as if the engine shuts down after a bad accident, the fuel pump gets shut down automatically so that fuel leaks won't feed any fires.

Yes, you can hook it directly to a switch... it's just not considered good practice.

Ccemn1

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Fiero fuel pump
« Reply #1 on: January 19, 2025, 02:20:06 PM »
I recently replaced my steering column because of a starter switch problem. Everything worked fine afterwards for about 3 miles, until I stopped to get gas & she wouldn't restart. I've got the 3.8 SC in it, checked the fuse, it was good, but because I didn't do the build, I haven't a clue where the fuel pump relays are? Engine seems to be fine, because I can start & keep it running with starting fluid.
My plan was to drop the fuel tank & run power directly to the pump, to see if the pump is shot, or it's an electrical problem going to it. My question is, if the pump is good, can I just run a hot line to it with a toggle under the dash to turn it on & off at will?