goliath88

How would you go by repairing the fuel pump circuit if it shorted?

goliath88

so, guess what i did.. dropped that tank after troubleshooting like crazy.
and guess what i found?

... a plastic bag.

yeah, a damn plastic bag in my tank!! as soon as i dropped it and looked inside i saw that bag wrapped up on the filter. didnt let it get any gas. put everything together, went ahear and removed the rear spring isolators just to see the difference, and cranks right up.

im telling you, ima have to keep a closer eye on this car. idk why people get the need to mess with cars.

but thanks again tuned for the help brotha. hopefully this is the end of that nonsence.

Tuned Performance

iTrader: (92)

Omg that's crud, hope it didnt allow the pump to overheat much, a locking gas cap and a shot gun might be a good investment lol

goliath88

yup.. this some **** here. but i got my area security guard watching it now

Tuned Performance

iTrader: (92)

sucks you had to go through all that ;(

goliath88

P.O.S

goliath88

Effing died again.

Tuned Performance

iTrader: (92)

Do you have a fuel pressure tester ? I'm thinking the bag was in there for a while and it overheated the pump I'm sorry to say. Just a guess though.

goliath88

Yea man I do. That's why I'm thinking. I'm a pro àt dropping this tank now so its whatever. Just getting stressed out. SCHURK mentioned something about a circuit, anyway to test that? I checked the green wire that goes th the relay to see if it lights up and it does.

Tuned Performance

iTrader: (92)

On the tan/wht you will have power for 2 seconds with the key on, after that when you crank you will get power when the ops closes.

goliath88

What if the ops doesn't close? Will that cause a "dead pump "? The pump wont turn on?

Tuned Performance

iTrader: (92)

If the ops is bad the pump will not run. You can jumper the ops orange to tan/white the pump should run. It is a normally open switch and at 4psi or higher the contacts connect and the pump will run.

Schurkey

The fuel pump is powered by EITHER the fuel pump relay, or the oil pressure switch.

If EITHER the fuel pump relay/wiring harness or the oil pump switch/wiring harness works, the pump will run.

The oil pressure switch system is a "back-up" to the fuel pump relay. Failure of the relay may cause extended cranking time--long enough to build oil pressure, close the contacts in the oil pressure switch, and then the pump pressurizes the fuel system.

If the fuel pump relay works properly, the oil pressure switch isn't needed.

goliath88

got it Schurkey. sounds like im visiting my gas tank again. noo sweat lol.

goliath88

sup tuned,
any fuel pump recommendations? im thinking going with a tpi pump, but dont want any issues with the excess pressure. what you think?? get a tpi pump? car is booone stock

Schurkey

I put an ACDelco EP241 on my '88 K1500; works fine. Pressure is controlled by the TBI regulator, not the pump.

The photo of the box on the Amazon web site is one I submitted.

Tuned Performance

iTrader: (92)

I agree the delco ep241

goliath88

What's the difference between that one and the EP386? Except for pricing? I believe that's the model number.

goliath88

I take it that the AIRTEX brand is garbage?

Tuned Performance

iTrader: (92)

The EP386 is a lower pressure pump and is for tbi so it will work well. Airtex = Do you enjoy dropping your tank , If your not in a real rush look for deals on ebay Delphi pumps are generally the same think you get in a acdelco or gm packaging.

Tuned Performance

iTrader: (92)

Do not buy a walbro just a fyi, years ago they had a bad batch that cost some turbo guys there engines. The walbro pumps have more of a amp draw and need a heaver gauge wire and relay so the pump will not burn it self out real quick.

Schurkey

I originally bought an Airtex pump for my K1500.


I won't install a Chinese pump. It's just too much labor to do it again when it fails prematurely.

goliath88

lol im not too fond of it lol. so the ep386 is for tbi setup/ thats weird cuz i was looking up iroc 5.7 pumps and that came out

thanks Schurkey ima stay away from that brand, not worth trying to save 20 bucks to redo this job again .

so delphi, or ac delco... but for sure run a tpi pump?

Tuned Performance

iTrader: (92)

http://parts-catalog.acdelco.com/cat...tock_check.php

I tpi pump will work fine and may have the same life as a tbi pump as long as you don't starve it for fuel much ( run out of gas).
Therotically a tbi pump puts out less pressure so when you regulate it down to 12 psi the pump is working harder.

goliath88

[quote=Tuned Performance;5528959]http://parts-catalog.acdelco.com/cat...tock_check.php

I tpi pump will work fine and may have the same life as a tbi pump as long as you don't starve it for fuel much ( run out of gas).
Therotically a tbi pump puts out less pressure so when you regulate it down to 12 psi the pump is working harder.

so youre saying that if i put the tpi pump at 12 psi, its gonna work harder?

Schurkey

No. Life is very easy for a fuel pump regulated to 12 psi. They "work harder" as the pressure INCREASES.

40--50 psi is not uncommon for port fuel injection. Sometimes higher.

goliath88

thats what i was thinking, guess i misunderstood. 241 it is . hopefully this resolves it. i noticed my ops had oil inside the connector, ima clean it up and see what it does. but found the pump for cheap so just might buy it and keep if i ever need it.

goliath88

well, dropped it again. and i started troubleshooting the sending unit. seems that there was a bad ground , and the harness to the sending unit was rusted out. i cleaned it, hit the connector with a brillo pad, cleaned it up again, and kept checking the ohmage over and over and over. as for now, the car runs again, have restarted it like 5 times. hopefully, this can keep this way til i can get the new harnesses. I dont wanna spend all the money on a new sending unit but if it must be done, then i guess i gotta do what i gotta do.

hope you guys are doing great. thanks again for allllllllll the help.

one92rs

iTrader: (5)

when you figure out the problem install one of these. takes the load off the original harness. I have been running one for over a year and it works great.
http://racetronix.biz/mmWEBSTORE/Images/FL98.jpg

http://racetronix.biz/itemdesc.asp?ic=FPWH%2D005&eq=&Tp=

naval_ned

Lists this part for TPI did you have to make any modifications for TBI or did it all work the same?

one92rs

iTrader: (5)

nope not at all. plugged right in.

goliath88

damn, that looks real good. future upgrade for sure. my problem is now in the tank. so far, its starting up. toooooo scared to drive it outside my complex. thanks though One92.