MustangMuncher

I recently put on an auto meter gauge for oil pressure and disconnected the old sending unit and wires. Now, as most of you know the fuel pump stops working. How can I wire around the old sending unit so the fuel pump stays on? I saw someone wired directly to the relay. Is there another way and if not how do I do that? Thanks.

RB83L69

Ummm, yeah.... just hook the old switch back up (or a new replacement one). There's no reason you can't use a T on the fitting.

Won't hurt anything, and then you don't have to hack on your car's wiring. Which by itself wouldn't be so bad, except that if you don't understand what you're doing, you'll end up creating more trouble for yourself in the long term.

Lo-tec

Wire the two wires together

MustangMuncher

Ok I figured it out. For those of you that have TBI, take off the fuel pump relay located on the firewall driver side. Take the tan and white wire or known as "A" on the 5 wire harness. Run an ignition wire to that terminal and throw the relay away. When you turn on the key from now on this will turn the pump on.

RB83L69

Hack

Glad it's not my car

MustangMuncher

probably because your cars a big piece of Gm factory ****. Splicing wires together doesnt hurt a damn thing. Remove the splice and look there its back to your wonderful GM factory setting. Its alright I am glad its not your car anyway...you wouldnt know what to do with it...let it sit inside all day and stare at it.

RB83L69

Hack

You don't have a clue what you're talking about or how it works, and you're trying to tell me how things should be done.

Go right ahead and hack up your car, won't bother me a bit.

But now that's just one more person I can't be bothered with helping in the future, when you run into some other issue you have no clue about (as the next issue you run into will probably be).

MustangMuncher

Yea, I will come to your over-so-knowing knowledge.... tell me does the fuel pump shut off when your car is running??? Nope....just the same thats going on here. Why don't you try some actual informational replies instead of.....well if it was me i would just wire it back up, or dont install a sound system cause that will blow out your windows. Your a moron that has 0 clue what goes on in a car. At least I found the wire, got it running, and can tell other people what does what now instead of your assumptions. Jack ***.

RB83L69

Sounds good to me...

Have a nice day, hack.

ede

i think the idea was to shut off the FP when the oil pressure droped below a set point, so as to not allow the engine to self destruct, but you're way to smart for me too so i'll stay out of it.

MustangMuncher

yes, your right that was the idea behind gm connecting the two together but I have a fuel pressure regulator for my carb. so the fuel is returning to the tank. the problem was i installed the new oil gauge and disconnected the old one. i thought it was unrealiable anyway. so case solved. over and done with.

thirdgen88

I think we can shut this thread down now..

Oh... Hack.

Bill87GN

Yup, definite Hack!

kevinc

Uh...ede said "oil pressure" not fuel pressure there stud. The GM design is such that the fuel pump will be shut off if oil pressure drops below spec...thus stopping the engine before it can seize.

The other nice thing this does is shut off the fuel pump every time the engine dies even if the ignition key is on.

For example, you're in a wreck, fuel lines get severed, with the GM design the pump is stopped. With your HACK the pump will keep right on spraying gas everywhere all over the accident scene.

This is what I was pointing to when I said "Future Darwin award pending" in your other post...first wreck will likely cleanse your genes from the pool.

Karps TA

iTrader: (2)

I don't know why you guys bother. It's obvious he knows way more about cars then anyone else on this site.

'Hack

Red Devil

-hack-

I never realized installing a 'T' fitting was so difficult.

-hack-

Let me help you with your next mod...



-hack-

Wider is better after all.

-hack-

I need to get something for this.

-hack-

Don't forget to cover your ***...



-hack-

I apologize ahead of time to anyone who drives a taxi.

-hack-

This is as good as using a worm gear clamp and carb fuel line hose to 'fix' cut up fuel tank lines on high pressure FI.



Why do people constanly refuse to do things the right way, then when **** hits the fan, those of us with a minimum+ of common sense have to deal with/pay for their stupidity?








Idiot.

dimented24x7

iTrader: (2)

Actually, the purpose of the sender, on the tbi cars anyway, was to provide backup switched power for the FP should the circuitry in the ecm that controls the fuel pump fail. I never bothered re-installing it in mine since its sort of a moot point, anyway. I do agree that some form of switched power that shuts off with the motor is needed, though.

Tibo

iTrader: (15)

Yes, and they put it all like that for a reason as stated prior. At least you are keeping the relay, RIGHT?

helrazor

iTrader: (3)

By that not being connected, would it cause for the car not crank or anything,at all?

dimented24x7

iTrader: (2)

No.

rgarcia63

If you installed a mechanical meter you really should have removed the oil pressure sending unit near the distributor instead of the oil pressure switch above the oil filter.

I don't know when GM stopped using the oil pressure switch as a safety switch, but my 88' still runs with the switch disconnected, as Vader, and others have have stated the switch is now a fuel pump power back-up source instead of a fuel-pump cutoff, and I'm using an 89' EPROM file, but I don't think that makes a difference.