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1998 gmc k1500 5.7 v8
replaced the fuel pump because the truck wouldnt start some days until i whacked on the fuel tank. besides the fact that the fuel gauge isnt working everything was fine for about a week. went to start the truck yesterday and she wouldnt stay running for more than a few seconds. bought a fuel pressure tester and got a reading of 44 psi the first time i tested it and a 48 the second time. i ordered a fuel filter. any other ideas? thank you
 

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Check ur fuel pressure regulator I was having about 5 psi bleed off soon starting my truck when mine went out
 
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