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Re: 99 chevy not getting fuel pump and relay are new s
Is your truck an Old Body Style (like a '96) or a New Body Style (like an '01)? Also you need to tell us what engine!! Generally speaking the Security system will disable the injectors and not the pump. Try replacing the 20a ECM B fuse in the underhood fuse block. This fuse supplies batt voltage to the pump thru the relay. Fuel pressure can only be checked with an operational fuel pump.
What I've said here applies to Old Body Style's only.
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57 Chevy 210
65 Olds 442 Convertible (Another one sold)
75 GMC Vandura 3/4 Ton
1999 K2500 Old Body Style Suburban (Gone but not forgotten)
05 Dodge Ram 3500/5.9 Cummins
2012 Toyota FJ Cruiser
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