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Old 08-10-2015, 08:24 PM
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Old 05-26-2010, 10:36 PM
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Cool Silverado won't start - fuel pump?

2000 Chevy Silverado 5.3L fuel pump issue?
My truck would not start. I assumed it was a bad fuel pump since I didn't hear it operating when key was turned on.

I measured the voltage at the engine control center 'prime' terminal and also at fuel pump connector with ignition switched on. Looks good for 2 seconds as expected for the prime.

I replaced the fuel pump. New pump sounds like it is working (comes on for the 2 sec prime). The truck still won't start. I repeated this many times: switch ignition on and off to help prime the system.

Also replaced fuel filter. I checked to see if there was any fuel pressure at the fuel rail. Just a little came out. I disconnected the fuel line at the pump and connected a hose directly off the fuel pump and nothing was coming out. I got another fuel pump (same manufacture) assuming I received a bad one. The same thing. Used some starting fluid - truck turns over a second or two until fluid burns off.
I used a fairly inexpensive one from 1Aauto $105.
Any other ideas on what I can test to verify a fuel pump issue.
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Old 05-26-2010, 10:45 PM
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from what you have tested I would say go buy a A/C delco fuel pump.
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Old 05-27-2010, 12:34 AM
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Try double checking your fuel pump relay, and the inline fuse that should be near the relay. I had a similar problem come into my shop and all it was was a 20 amp fuse that kept getting over looked.
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Old 05-27-2010, 08:50 PM
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I swapped the fuel pump relay with the horn relay (they were the same).
No difference. Horn still works too.

I re-checked the fuel pressure at the access point on top of the engine. nothing is coming out.
I squirted some gas into the carb and it started up and ran for 4-5 seconds.

Where is the inline fuse. I didn't see anything labeled.
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Old 05-27-2010, 10:32 PM
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I checked a bunch of fuses-basically anything related to fuel.
Nothing bad.
Maybe I should buy a different fuel pump with a more reputable brand.
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Old 05-27-2010, 10:34 PM
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OEM Part # Price

Without EVAP Emissions 19121627 $469.11

With EVAP Emissions 25345026 $482.00

Contact dealer for most current part and price information.

Above is straight out of the factory manual. If you are only paying $105.00, it can not be very good. As long as you have power and ground to the pump the problem has to be the pump. I recommend a better pump preferably Ac Delco.
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Old 02-01-2011, 12:51 AM
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are the injectors clean? ...when you turn the key on, do you get any spray?
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