Car died on the way home. Help please

[jopaustu]

Confirmed no power to fuel pump. I am using Racetronix Hotwire set up. No signal from the original factory wiring to fuel pump that now is being used to energize the Hotwire relay. Confirmed power into the ECM. not sure which pin is for the fuel pump.. I know there is a momentary signal to pressurize the fuel system when the ignition is initially turned on .Which relay in the engine bay is the fuel pump relay? Which pin sends the signal from the ECM? Anything else that I'm missing that may interrupt the fuel pump?

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[TurboBob]

is the car stranded? can you get it home?

Bob

 

[Racetronix]

Confirmed no power to fuel pump. I am using Racetronix Hotwire set up. No signal from the original factory wiring to fuel pump that now is being used to energize the Hotwire relay. Confirmed power into the ECM. not sure which pin is for the fuel pump.. I know there is a momentary signal to pressurize the fuel system when the ignition is initially turned on .Which relay in the engine bay is the fuel pump relay? Which pin sends the signal from the ECM? Anything else that I'm missing that may interrupt the fuel pump?

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There is diagnostic info and schematics on our support forum.

 

[TurboBob]

it looks like he is on his phone, probably at the side of the road.

I have the manuals here and can look stuff up if needed.

Bob

 

[jopaustu]

I was actually able to coast the car home the last half mile. Stranded in the driveway not not in its home aka garage. I will check the support forum. I ran a Hotwire just to prime the fuel rail thinking I could just start it real quick and get into the garage but it would not even start then. Has me wondering if there's more to this problem then the fuel pump not energizing. I am by no means a guru with automotive circuits.

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[jopaustu]

I am getting readings out of the ScanMaster . tells me that the ECM is processing some information. Obviously not the running information

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[TurboBob]

do you have the shop manual, it has the info where the wires run. when you tried to prime it, where did you connect?

Do you have a voltmeter or test light?

B

 

[jopaustu]

I connected to the red wire going into the fuel pump at the connector and the positive terminal of the battery. confirmed fuel pressure with my fuel gauge. Turn the ignition over no start. I do have a volt meter and test light. I will check my manual for wiring. Had to go back to work for a little while unfortunately

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[Racetronix]

 

[TurboBob]

the ecm keeps the fuel pump relay energized when the engine is running, so that circuit has some redundancy.

you will have to trace the circuit out.

a friend of mine had a bad connection in the stock harness (under the rear seat I think) that caused an occasional stall like yours. there is a connector or splice or something that went bad.

Bob

 

[jopaustu]

I have no momentary signal to the fuel pump when initially turning the key over.

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[Racetronix]

 

[TurboBob]

the oil pressure switch is a redundant feature to keep the engine running in case of a FP relay failure, not the other way around.

Bob

 

[TurboBob]

I have no momentary signal to the fuel pump when initially turning the key over.

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the ecm only primes if it has shut all the way down. (key off for 15 sec or more), it does not prime on short key-off cycles.

you are going to need to ring out the whole circuit, but at least its not intermittant....

Bob

 

[jopaustu]

I am trying to download the shop manual of an old link from last summer. My shop manual does not show anything to do with the fuel pump out of the E C M this is an 86 model Regal. I'm trying to get an idea of how the circuit works. Can I have a bigger problem due to the fact that I provided fuel in the car still would not start. This is been a solid car I've not had any issues with it went through all the basics that I can think of. Sometimes I have issues deciphering automotive circuitry. I very much appreciate everyone's help

 

[TurboBob]

http://www.vortexbuicks-etc.com/fuel_pump.htm

 

[TurboDave]

Have you checked the obvious? FP/INJ fuse??

 

[jopaustu]

Quick update. I just found a blown 20 amp fuse the fuse panel beneath the driver side dash. Tthe writings actually scratched off but it is directly below the CCCI 10 amp fuse

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[TurboBob]

fuses don't just die, they get murdered..... the vortex site has a pretty good list of things to check for this.


Bob

 

[earlbrown]

Also, look at the blown fuse. They tend to blow in two different ways. They either sag and basically drip in two, OR it's all blackened in there where the fuse got blown to bits. The latter is a sudden serious current draw or direct short.

Looking at your blown fuse might be a clue on where to start looking. I'm guessing a short since the service manual says there should be a 15 there..

Here's a wiring diagram with more contrast, page 17....