The rubber hose in the return line between the OFV to the tank are known to deteriorate and suck air causing the lift pump to lose prime.
Also, not sure on your engine, but on our trucks there is a fuel heater between the pre-filter bowl and the base that also causes problems. Most remove it and throw it away.
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Scott
2003 Avalanche Z71
Common sense is like deodorant. The people that need it most never use it.
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