89 fuel pump failure? Or...?
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89 fuel pump failure? Or...?
'89 Bronco, 5.0, EFI. Just bought from a cousin. History of two fail to start after running. His theory oxygen sensor or coil.
Tonight, idling in drive thru, hear a buzzing noise. Pitch increases, and vehicle runs rough and stalls. Restarted and limped to parking lot...won't start at all. 15 minutes later, starts and runs.
Drives fine at highway speed 10 miles to home. Leave at idle in driveway, whine starts up again...frame mounted fuel pump whining (getting louder). Vehicle dies.
Okay, is it whining because it's bad, because the tank pump is bad, or could there be something floating around in the tank that covers the inlet from time to time? The vehicle belonged to a high-school kid around a year ago...maybe He had someone who didn't like him?
Any help will be greatly appreciated. I don't want to pull the fuel tank unless I absolutely have to.
Thanks in advance, Jon.
Tonight, idling in drive thru, hear a buzzing noise. Pitch increases, and vehicle runs rough and stalls. Restarted and limped to parking lot...won't start at all. 15 minutes later, starts and runs.
Drives fine at highway speed 10 miles to home. Leave at idle in driveway, whine starts up again...frame mounted fuel pump whining (getting louder). Vehicle dies.
Okay, is it whining because it's bad, because the tank pump is bad, or could there be something floating around in the tank that covers the inlet from time to time? The vehicle belonged to a high-school kid around a year ago...maybe He had someone who didn't like him?
Any help will be greatly appreciated. I don't want to pull the fuel tank unless I absolutely have to.
Thanks in advance, Jon.
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Joined: Jul 1999
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89 fuel pump failure? Or...?
Jon ,
It has been my experience the fuel pumps on your vintage of truck make some very odd noises especially when the outside temp rises ...it just seems to be a characteristic of the pumps . Before you replace the pumps verify they are the problem , check fuel pump pressures , find out when the last time the filters were changed , check that the fuel pressure regulator is functioning properly . Idle problems / stalling can also be attributed to carbon buildups on the throttle plates / Idle Air Bypass . You can always check for EEC Trouble codes . Lots of possibilities ...always verify a part has failed before you replace it otherwise you just end up wasting time and money chasing a problem .
Paul
It has been my experience the fuel pumps on your vintage of truck make some very odd noises especially when the outside temp rises ...it just seems to be a characteristic of the pumps . Before you replace the pumps verify they are the problem , check fuel pump pressures , find out when the last time the filters were changed , check that the fuel pressure regulator is functioning properly . Idle problems / stalling can also be attributed to carbon buildups on the throttle plates / Idle Air Bypass . You can always check for EEC Trouble codes . Lots of possibilities ...always verify a part has failed before you replace it otherwise you just end up wasting time and money chasing a problem .
Paul
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Joined: Sep 1999
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89 fuel pump failure? Or...?
I'd replace the fuel filter before tying anything else. the dying then restarting after having sat for awhile usually is a good indicator of a restricted fuel filter. your fuel pump may be whining because it is building too much pressure in the line between the pump and the filter, overloading the pump.
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Joined: Apr 2000
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89 fuel pump failure? Or...?
I agree with the previous post. Change the fuel filter. I had a similar problem on an 84 Porsche 944. It started losing power and then would stop altogether. If I let it sit for 10 min then it'd start right up and run fine for a few minutes and then the same thing. A new filter took care of it. Start with the filter before anything else.
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