How to Walbro pump
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Is there power to the + post? You have to be quick on that one, turn on the key and test it within 7 seconds or so.
Do you hear it running?
Do you hear it running?
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Elder User
Joined: Jun 2007
Posts: 570
Likes: 0
the stock pump worked when i took it off
took stock pump off, put walbro on, didn't work. unhooked batteries,
put stock pump on, it pumped, but not like it should have i don't think, unhook
batteries, put walbro on, nothing, unhooked batteries, checked fuses, the fuel
pump/PCM is blown, replace still nothing. i kept the PCM unhooked, cause i took my chip out
took stock pump off, put walbro on, didn't work. unhooked batteries,
put stock pump on, it pumped, but not like it should have i don't think, unhook
batteries, put walbro on, nothing, unhooked batteries, checked fuses, the fuel
pump/PCM is blown, replace still nothing. i kept the PCM unhooked, cause i took my chip out
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
the stock pump worked when i took it off
took stock pump off, put walbro on, didn't work. unhooked batteries,
put stock pump on, it pumped, but not like it should have i don't think, unhook
batteries, put walbro on, nothing, unhooked batteries, checked fuses, the fuel
pump/PCM is blown, replace still nothing. i kept the PCM unhooked, cause i took my chip out
took stock pump off, put walbro on, didn't work. unhooked batteries,
put stock pump on, it pumped, but not like it should have i don't think, unhook
batteries, put walbro on, nothing, unhooked batteries, checked fuses, the fuel
pump/PCM is blown, replace still nothing. i kept the PCM unhooked, cause i took my chip out
Edit: Before you try to start turn key on, you should here pump run for about 20 seconds. The Walbro is harder to hear then the stock pump.
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Thread Starter
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Elder User
Joined: Jun 2007
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I won't be able to start the engine, cause i have a few things off of it. I tried a few times when the pcm was plugged in, fuses ok, and still nothing
The fuel pump will not run without signal from PCM to control it. There is a fuel pump monitoring lead from the pcm. Hook up PCM, make sure fuse is ok, and attempt a start.
Edit: Before you try to start turn key on, you should here pump run for about 20 seconds. The Walbro is harder to hear then the stock pump.
Edit: Before you try to start turn key on, you should here pump run for about 20 seconds. The Walbro is harder to hear then the stock pump.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
No need to start truck to est to see if pump will run. You can always run a hot lead off the battery to see if the new pump works. If it doesn't run then the - or ground lead is bad or the pump is bad.
Do you have a volt meter. Check to see if the + lead is hot with the key on. Also check the - lead for ground. Also ceck to make sure pump motor winding is not shorted.
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