wrapper8758

iTrader: (3)

I tried to find the fuel pump test jumper near my a/c unit on passenger side harness...dont see it anywhere.
I tried jumping my ALCL connector between G and ground....still didnt work.
Then I figured I'd try jumping from the fuel pump relay connector(While unplugged from relay)between E (in line fuse) and c (pump relay controll) BAD IDEA......Blew the fuse.
After I replaced fuse & turned key to run, pump primes and never stops. What did i screw up?????

wrapper8758

iTrader: (3)

Anyone?.....need help please.

t5camaro

maybe the relay stayed stuck, try swapping them

nhraformula

sounds like you shorted hot to ground to pop a fuse wiring diagrams would be helpful try tracing wires to see what controls the coil on the relay also if the fuse is the link between your hotwire and the coil on the relay then maybe you jumpered that directly to your fuel pump in that case the fuse is not designed to carry that much current either, nor is the device that controls the coil for the relay. In either case case you may have screwed up the device that controls the coil on the relay

wrapper8758

iTrader: (3)

I was using the diagram.I unplugged the relay altogether and jumped the connectors on the relay plug.

nhraformula

on your relay connector there are only two wires you can jumper without shorting anything I am not much on car electronics but am an electronics tech in a steel mill. some relays have a diagram on them to show which terminals are for the coil and which are for the device you want energize and in some instances deenergize. now if the pump is shutting off when you turn the key off then the relay is probably good. but when you turn the key on the pump runs and should shut off if car is not running. if pump stays on then the device that controls when to energize the coil on the relay is not working properly. not sure what device does this may be ECM itself or there may be a fuel pressure switch that shuts it off when you build up so much pressure. Thats just a guess but I would have to read the prints to see what actually controls this to be sure

wrapper8758

iTrader: (3)

Im hoping one of the TPI gurus will chime in and tell me what i killed.
from looking at the diagram, its a 12 volt signal from the ECM. I hope i didnt fry it, but I think so.
As long as i can drive it until I can replace Whatever is N/G I'll feel a little better.

nhraformula

wish you luck with getting that fixed

nhraformula

you could try disconnecting the battery as this will be like cycling power to your ECM. I have fixed several things at work this way

1989GTATransAm

iTrader: (3)

Could be your oil pressure sending unit. Try unplugging it after you shut off the motor and see if the fuel pump stops running. If it does replace the oil pressure unit.

wrapper8758

iTrader: (3)

Nhra, I tried unplugging the battery ....same thing.

1989gta,
I will try that. I show oil pressure on the guage though. I saw that on the diagram too.....(oil press switch)
The car will run and drive,just never stops priming if you turn key to run/accy without starting. I cant believe how stupid I was to do this.
Im gonna probaly foul my plugs eventually.

nhraformula

I might be able to help a little better if I saw the diagram

wrapper8758

iTrader: (3)

Ill try to scan the page and post it. I want to test that oil pressure sending unit tomorrow like 1989gta said.

nhraformula

hopefully it'll be just a sensor and not the ECM

BigBadLou

iTrader: (3)

Diagram right here: http://www.austinthirdgen.org/mkport...ine_wiring.gif

If I understand it right, you put the relay back and now the pump runs with the key ON? That would point to a blown ECM output (what you called pump relay control). You can live with it for now but the only way to fix it would be to replace (or repair) the ECM.

Hope this helps.
Lou

wrapper8758

iTrader: (3)

Thanks Lou,
Im trying to find a new ECM

t5camaro

You wouldnt want to put a switch on the fuel pump would you?

nhraformula

how many terminals are there on your fuel pump relay?

BigBadLou

iTrader: (3)

The relays have 5 terminals. 3 on the power (switched) side, 2 on the control (actuating) side.

Lou

P.S.: Wrapper, if you have a TV/stereo repair shop close by, you can ask them how much it would cost to replace the burned out transistor in the ECM. Or you can do it yourself if you're handy with electronics.

nhraformula

looking at the diagram there is also a fuel pump switch not sure what this or why its there but when that switch is on then fuel pump is on if that switch operated by fuel pump relay then it is your ECM otherwise may be another device controlling that switch. but diagram doesn't show ECM controlling that switch

BigBadLou

iTrader: (3)

Are you talking about the oil pressure fuel pump switch? It is a back up switch in case the ECM fails to activate the fuel pump, then this switch turn the pump on once you build up oil pressure.

Lou

nhraformula

yes, the diagram just labels it as a fuel pump switch but I didn't know what it was for. but knowing that it is definitely the ECM

wrapper8758

iTrader: (3)

Fellas,
I appreciate all of your help.Im having a REEEEL crappy week.first the ecm frying, then last night my house flooded from a power failure, rained all night, no sump pump........ evrything was floating .I cant look at my car until i clean this friggin disaster. (which Ive been trying to do since 4:30 am)
Ill keep you posted with my findings.
Thank you all!!

BigBadLou

iTrader: (3)

I'm with ya, bud.
Same crappy week here. Including a car-down situation when I took the distributor out last night to go get it tested at AutoZone. Brought it back home, dropped it in (correctly, it's NOT 180* off ) and the car won't start, no matter what I do. No spark. I think that test fried it.
On top of that, I don't have my truck back either (was supposed to today) so I'm limited to car parts stores that are within biking distance.

Hope the weekend goes well for all of us!!
Lou

eschevyrda

i had the same problem on my tbi it got to the poit where it drained my battery i soled my problem by tracing a fried wire all the way to my fire wall and the wire that went to the fuel pump was re routed