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Old 09-19-2014, 07:15 AM   #1
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Does a bad fuel pump thow a code?

Or are there any other codes thrown due to a bad fuel pump?
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Old 09-19-2014, 07:31 AM   #2
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Generally no, I don't believe the FP is connected into the OBD system. Mainly to determine fault you'd have to check for fuel rail pressure, power at the connector, and listening to see if it primes.

As you have an '03, if your FP died it may have been due to a clogged fuel filter in the sending unit (integral). I had that happen to me, went through several new pumps before I took the sending unit apart.
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Old 09-19-2014, 07:49 AM   #3
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This is very general and may not pertain to Porsches/Boxsters, but a bad fuel pump can cause a lean condition that would trigger a CEL. Do you have a CEL, and if so, what is it?
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Old 09-19-2014, 04:24 PM   #4
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Quote:
Originally Posted by Jamesp View Post
Or are there any other codes thrown due to a bad fuel pump?
When my fuel pump started to fail, there were no Check Engine lights or error codes.
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Old 09-19-2014, 04:43 PM   #5
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On most cars a solid check engine light means something is not working that effects the emissions of the car.
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Old 09-20-2014, 03:17 PM   #6
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When mine went there was a loss of power and an unwillingness to rev. No check engine light but two codes pertaining to a lean running condition. The loss of power was intermittent.
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Old 09-20-2014, 06:19 PM   #7
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I have an intermitent SAI code. The car generally runs strong when first started and may run strong when hot or may refuse to rev above 3500 or stay running below 2000. It may behave and run perfectly as well. It's a whole new experience every time I drive it. I have cleared the SAI and it stays gone for a short period then reappears even when the ambient temp stays above eighty degrees.
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Old 09-20-2014, 07:19 PM   #8
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For the SAI code, follow the lines. I had the small check valve break off and was not actually putting the air into the plenum. It threw the code sometimes, and sometimes not.
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Old 09-21-2014, 10:30 AM   #9
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The SAI only works for a limited time after a cold start- no?
After I removed my FP I put power to it while it sat on the ground and it whirled intermittently- in the process of seizing. Fuel pressure? If it's the pump it's strange that there's no lean codes...
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Old 09-21-2014, 02:05 PM   #10
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When my fuel pump went, there were no codes. Just stalled while doing about 65mph on the freeway.
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