Jumping the Fuel Pump Relay...Downsides?
10-13-2007, 07:36 PM
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Jumping the Fuel Pump Relay...Downsides?
I have an '82 US Automatic with the all-too-common fuel pump relay hard-start problems. Is there a downside to jumping the poles of the relay (iirc, #30 & #87), other than the safety consideration of the fuel pump continuing to pump gas with the key on-engine not running?
Last edited by rhys; 10-13-2007 at 10:57 PM.
10-13-2007, 08:24 PM
#3
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What are the "all-too-common fuel pump relay hard-start problems"? How does jumpering the relay do any more for you than having a properly-functionineg relay?
10-13-2007, 08:28 PM
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Not sure about your MY but this is the most common relay and sells @ 928 SP for $4.50 ea.
I replaced all as a maintenace item for a 20 yr old car.
I replaced all as a maintenace item for a 20 yr old car.
10-13-2007, 09:28 PM
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It doesn't run when the key is in the off position. It operates when the key is turned on. I ran a car for several years that way. I even hid a toggle switch to use as an anti theft device. Downside is if you are in an accident the fuel pump will continue to run until the key is turned off. It could be a fire risk.
10-13-2007, 10:21 PM
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No, this is the LEAST common relay for the OBs, totally non-interchangeable with any other relay in the car and sells for around $60
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10-13-2007, 10:21 PM
#8
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It doesn't run when the key is in the off position.
And it is a more expensive relay than the standard fuel pump type on the later cars...
however - fix the root cause - this really is a simple circuit...
Alan
10-13-2007, 10:23 PM
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It doesn't run when the key is in the off position. It operates when the key is turned on. I ran a car for several years that way. I even hid a toggle switch to use as an anti theft device. Downside is if you are in an accident the fuel pump will continue to run until the key is turned off. It could be a fire risk.
10-13-2007, 10:32 PM
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Apart from pointing out the obvious savings of over $50, it's something that can be done tomorrow morning without waiting for a shipment from California.
10-13-2007, 10:35 PM
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I don't want to seem snippy, but I'm getting contradictory information from people who don't have OBs. I don't want to hear from someone with a '94 or an'88 unless you have specific personal hands-on existential knowlege of how this works. FBIII seems to be the only verifiable source, so far, in that he has actually run his car this way over time. Anyone else want to weight in?
10-13-2007, 10:48 PM
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You said it was an '81.... it doesn't matter though 82's are the same.
BTW - In case you wonder - I don't guess at these things...
If you jump 87 & 30 (which are the relay switch terminals) it will run forever & always - regardless of what anyone else says.
If you need proof - just try it.
If you jump 87 & 15 (which others may have tried) it will be switched - but also unfused (do not do this!).
Just fix the root cause - start with a new relay - thats most likely.
Alan
BTW - In case you wonder - I don't guess at these things...
If you jump 87 & 30 (which are the relay switch terminals) it will run forever & always - regardless of what anyone else says.
If you need proof - just try it.
If you jump 87 & 15 (which others may have tried) it will be switched - but also unfused (do not do this!).
Just fix the root cause - start with a new relay - thats most likely.
Alan
10-13-2007, 10:52 PM
#13
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OK fine I'll shut up then...
Having the same model year is actually a very poor gauge of the quality of responses - I'll let you figure that one out for yourself....
Alan
Having the same model year is actually a very poor gauge of the quality of responses - I'll let you figure that one out for yourself....
Alan
10-13-2007, 11:13 PM
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I don't want to seem snippy, but I'm getting contradictory information from people who don't have OBs. I don't want to hear from someone with a '94 or an'88 unless you have specific personal hands-on existential knowlege of how this works. FBIII seems to be the only verifiable source, so far, in that he has actually run his car this way over time. Anyone else want to weight in?
What I stated is accurate for my car..........bon chance 'snippy'