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Old 03-16-2012, 07:36 PM   #1
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fuel pump?

Today while on the interstate my 89 mustang died. I was able to start it back up and as long as I kept the rpms high it would run but it was lurching and the exhausted smelled rich. It finally died without me being able to to start it up again and I had to call a tow truck. While waiting for the tow truck I tried to start it and it fired right up, no sputtering at all... what gives???
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Old 03-16-2012, 07:53 PM   #2
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Re: fuel pump?

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Originally Posted by shawnpbigelow View Post
Today while on the interstate my 89 mustang died. I was able to start it back up and as long as I kept the rpms high it would run but it was lurching and the exhausted smelled rich. It finally died without me being able to to start it up again and I had to call a tow truck. While waiting for the tow truck I tried to start it and it fired right up, no sputtering at all... what gives???
Fuel pressure regulator may have played out.
Hard to say for sure.
Check your fuel pressure and engine timing to make sure it has fuel and spark.
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Old 03-16-2012, 08:42 PM   #3
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Thanks Trojan. I will make sure the garage checks that.
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Old 03-16-2012, 08:52 PM   #4
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Re: fuel pump?

Have them check the MAF and O2 sensors too, as they parts of the fuel system controls.
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Old 03-16-2012, 09:01 PM   #5
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Also with the recent research I've done on the fuel pump relay it seems like this is a possibility.and also the ignition module.

So what happens is when you turn the key forward the fuel pump will prime,pressurizing the system.this is done from a 12 volt ignition source.but by doing this the pump will only run for a few seconds.it will not run until the ignition module which is mounted on the distributor tell the ecm the car is running.once this happens the circuit in the relay will kick on energizing the pump.if something in the relay or module is not functioning right then it is possible that you are still able to prime the pump but not let it run while the car is.

Now I'm not disagreeing with TH.there is a very good chance that the pump is bad or going bad.but all these things can be tested.
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Old 03-16-2012, 09:24 PM   #6
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I changed the ignition mod about 6 months ago, cause it was dying on me and that fixed it. These symptoms are slightly different then that.
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Old 03-16-2012, 09:25 PM   #7
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Also check the relay.
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Old 03-16-2012, 09:39 PM   #8
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Thanks dreamstang. Will do.
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Old 03-16-2012, 09:41 PM   #9
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no problem.good luck and hope you get it taken care of.
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Old 03-17-2012, 09:02 AM   #10
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Re: fuel pump?

Quote:
Originally Posted by dreamstang View Post
Also with the recent research I've done on the fuel pump relay it seems like this is a possibility.and also the ignition module.

So what happens is when you turn the key forward the fuel pump will prime,pressurizing the system.this is done from a 12 volt ignition source.but by doing this the pump will only run for a few seconds.it will not run until the ignition module which is mounted on the distributor tell the ecm the car is running.once this happens the circuit in the relay will kick on energizing the pump.if something in the relay or module is not functioning right then it is possible that you are still able to prime the pump but not let it run while the car is.

Now I'm not disagreeing with TH.there is a very good chance that the pump is bad or going bad.but all these things can be tested.
Good info! I know I can count on you and others to fill in the blanks and add info I might forget or don't even know. With all of us working together we can do a pretty thorough job of diagnosing problems. Thanks!
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Old 03-17-2012, 10:47 AM   #11
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No problem.and thanx
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