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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Tue May 12, 2015 10:08 am Post subject: Fuel pump whine |
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After shutting my car off, fuel pump seems to keep running for quite a while, especially if the engine isnt completely warm when I turn off the key.
If I remember correctly, isnt this a dead give away for a bad oil PSI sender? _________________
'88 FORMULA |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Tue May 12, 2015 5:28 pm Post subject: |
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May not be bad. If the oil is cold and thick it will hold oil pressure for a little bit. As long as the oil pressure is higher then the minimum the switch is set for the pump will continue to run. |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Tue May 12, 2015 10:16 pm Post subject: |
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So its somewhat normal for the pump to run 5ish seconds after I turn off the key? |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Wed May 13, 2015 6:20 am Post subject: |
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Yes. See it many times. It's just the oil pressure bleeding off. |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Wed May 13, 2015 8:10 am Post subject: |
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I have noticed it more since the new engine. |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Wed May 13, 2015 4:21 pm Post subject: |
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Clearances are probably tighter so the pressure bleeds off slower. |
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fiveoformula Member
Joined: 08 Aug 2007 Posts: 1799 Location: OR
1988 Pontiac Formula
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Posted: Wed May 13, 2015 6:47 pm Post subject: |
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That's what I was thinking. The factory oil pressure gauge pegs out when the engine is still warming up and 2k rpm. Comes down to around 25-30 warm idle. |
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