90 Aerostar fuel pump
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90 Aerostar fuel pump
hello everyone,
I have a '90 Aerostar with, what I think is, fuel pump failure. After two failed pump replacements, I've begun to think it is a voltage problem. I have voltage but it is 6.7 volts at the harness disconnect and the pump plugin. Is this correct? If not what would cause this?
Thanx, Trex49
I have a '90 Aerostar with, what I think is, fuel pump failure. After two failed pump replacements, I've begun to think it is a voltage problem. I have voltage but it is 6.7 volts at the harness disconnect and the pump plugin. Is this correct? If not what would cause this?
Thanx, Trex49
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I have a 91, trust me you need 12 ish at the pump, engine off. What could it be?? bad fp relay, bad inertia switch, more likely bad connection somewhere along the way. read my post "bring em back alive" powered fuel pump with cig lighter power in emergency. you need 12.
Ken
Ken
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From: Washington state
low voltage puts additional strain on the fuel pump; current demand tries to go up, pump runs far longer trying to get up to pressure, heating occurs=dead burned out pump motor
depending on where the failure is at, can cause wire heating, if in fuel tank, fuel vapors+heat=booooom=no van
fuel tank wire overheating brought down a 747 and about 300 souls went to heaven
depending on where the failure is at, can cause wire heating, if in fuel tank, fuel vapors+heat=booooom=no van
fuel tank wire overheating brought down a 747 and about 300 souls went to heaven
Last edited by 96_4wdr; Oct 30, 2005 at 09:29 AM.
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I agree that extra strain and heating occurs, one thing you don't have to worry about as long as there is a drop of wet gas in the tank is a fire. fuel vapor displaces air. no air no boom. a running electric fuel pump has the sparking motor brushes at all times. the concept, while worrisome, just isn't real. witness the fact that there has never been a tank fire caused by the pump in 30 odd years.
Ken
Ken
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I believe you are completely correct. I remember when I first heard of in-tank electric pumps. Boy, I thought that was stupid.
To the poster, did the car run with that voltage present? remember, the open circuit voltage is almost irrelevant. the voltage present with the pump running is the important. If there is 6.7 volts open circuit, my thought is near zro with the pump hooked up. find your bad connection!!
Ken
To the poster, did the car run with that voltage present? remember, the open circuit voltage is almost irrelevant. the voltage present with the pump running is the important. If there is 6.7 volts open circuit, my thought is near zro with the pump hooked up. find your bad connection!!
Ken
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From: Washington state
you do have a good point Ken, no gas tank fires that we know of from intank high pressure fuel pumps.
what makes the motor, communtator and brushes safe is that they are bathed and run in liquid gasoline for lubrication and cooling, never run the tank on a intank fuel pump vehicle completely dry, dangerous, exposes pump motor to overheating and sparking, can't get a spark in a liquid, even pure gasoline
ever hear about the Texan who used to check the fuel level in his in ground gas tank by dropping a light match down the fill pipe and looking in?
made the Gulf of Mexico, they do things BIG down there
what makes the motor, communtator and brushes safe is that they are bathed and run in liquid gasoline for lubrication and cooling, never run the tank on a intank fuel pump vehicle completely dry, dangerous, exposes pump motor to overheating and sparking, can't get a spark in a liquid, even pure gasoline
ever hear about the Texan who used to check the fuel level in his in ground gas tank by dropping a light match down the fill pipe and looking in?
made the Gulf of Mexico, they do things BIG down there
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