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you should have at leat 55psi of fuel when starting or it will nerver happen that is if your 4.3 is a vortec. change your fuel filter at the same time try to keep more than 1/4 tank of gas at all times that is what keeps the fuel pump cool and lets it have a nice long life. i would replace it with ac delco its worth the few pennys extra. God Bless
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