fuel pump woes....
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
Good idea. How responsible are you? Responsible enough to turn it off in an accident even if you are hurt or passed out? Right now, if the motor dies, pump goes off. Without that safeguard, if the motor dies because the accident is bad enough, the pump keeps going on till you turn it off. In the meantime, fuel sprays all over. You getting the warm feeling? Unless you want a "dead man switch" on the pump.
ECM won't care. You just won't get pump voltage showing up on your scanner. Can you define what you are worrying about really? You'd still need a fuse whether it goes through the fuse box or external and you'd still need a relay. What is the issue with the oil pressure switch? I have disconnected it and my car starts and runs.
ECM won't care. You just won't get pump voltage showing up on your scanner. Can you define what you are worrying about really? You'd still need a fuse whether it goes through the fuse box or external and you'd still need a relay. What is the issue with the oil pressure switch? I have disconnected it and my car starts and runs.
Team Owner
Joined: Jul 2004
Posts: 28,424
Likes: 3,276
From: Hartford WI
I guess you're right...I wasn't the best electrical "diagnostician" when I got this car......wasn't thrilled about figuring out how relays worked, pins a through whatever. But since I been through this a couple of times, I'm beginning to see how it all works...the fuel system that is. I'm a yooper....got to know how crap works....now that I do, I was just wondering if there wouldn't be a easier way to do it without all the switches, relays, wires and connectors.....probably why racetronix uses the alternator for power....engine off, pump off.... Just seems like GM went a long long way to turn a pump on...anyway....it's sunday...south florida, weather is good, I'm on the way out.....thanks again....Paul
Team Owner
Joined: Sep 2001
Posts: 62,141
Likes: 1,729
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
If the alternator is completely dead the voltage would still be supplied by the battery in the circuit until it also died, it just wouldn't power the pump up to its maximum ability.
The RX just uses the hot wire as extra juice via a thicker wire.
The RX just uses the hot wire as extra juice via a thicker wire.
Team Owner
Joined: Sep 2001
Posts: 62,141
Likes: 1,729
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Final update:
the black wire (ground) and the grey(power) had been spliced and had heat shrink over them...been like that since I had the car...thought it was factory....pulled a little on the black connector...the wire came right out....spliced it back , plugged it back it to the car's wiring harness, and vroom....lots of pressure.....Also, the issue at the fuse panel was an old fuse...not blown, but a new one solved the problem.....
This is the 2nd time i've went around with this....wasn't aware racetronix had a harness from the alternator.....why can't I just run a wire from a hot switch in my car back to the fuel pump and turn it on manually?.....wouldn't need to worry about oil switch, fuel pump relay, inline fuse, would be bypassing the old fuse box.....and all those old connections and connectors......wouldn't hurt the ecm would it???? Anyway, thanks for all the input.....she's running sweet as sugar again....
the black wire (ground) and the grey(power) had been spliced and had heat shrink over them...been like that since I had the car...thought it was factory....pulled a little on the black connector...the wire came right out....spliced it back , plugged it back it to the car's wiring harness, and vroom....lots of pressure.....Also, the issue at the fuse panel was an old fuse...not blown, but a new one solved the problem.....
This is the 2nd time i've went around with this....wasn't aware racetronix had a harness from the alternator.....why can't I just run a wire from a hot switch in my car back to the fuel pump and turn it on manually?.....wouldn't need to worry about oil switch, fuel pump relay, inline fuse, would be bypassing the old fuse box.....and all those old connections and connectors......wouldn't hurt the ecm would it???? Anyway, thanks for all the input.....she's running sweet as sugar again....
Thread Starter
Drifting
Joined: Jun 2013
Posts: 1,590
Likes: 60
From: ft myers FL/Munising MI
