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Today, 08:10 AM
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#1 |
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Registered User
Join Date: Mar 2012
Location: Woodbury, Ct.
Posts: 1,681
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Fuel Pump Not Priming
My 6.0 swap (2005 DBW) has been running flawlessly for about 7 years. Recently it has on occasion failed to activate the fuel pump when turning the key on which would cause it to fail to start. I cycle the key back to off and on again, then I here the pump prime and it runs fine.
Could this be the relay going bad? The pump? |
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Today, 09:59 AM
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#2 |
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Registered User
Join Date: Oct 2013
Location: Alabama
Posts: 1,220
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Re: Fuel Pump Not Priming
check your grounds. I've found that most electrical gremlins that involve components working "erratically" involve a bad or loose ground.
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Today, 01:36 PM
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#3 |
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Senior Member
 
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,147
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Re: Fuel Pump Not Priming
I agree with Willie M....check grounds first, then check for power to the fuse and to the relay with key in run position.
The PCM sends 12v to the fuel pump relay to trigger it. It could possibly be the relay is going bad and failing intermittently.
__________________
1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer ............. 
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Today, 01:47 PM
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#4 |
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Senior Member
Join Date: Mar 2015
Location: washington
Posts: 2,243
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Re: Fuel Pump Not Priming
I believe it is the other way around.
The PCM grounds the fuel pump relay to trigger it. |
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Today, 02:16 PM
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#5 |
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Senior Member
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,147
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Re: Fuel Pump Not Priming
Maybe on some? but not on mine.
__________________
1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............
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