New Fuel pump turns on, but wont pump fuel
#1
New Fuel pump turns on, but wont pump fuel
I have an automatic 2003 silverado 5.3 that stopped running. It had air and spark, but no fuel pressure so i decided to replace the fuel pump. Installed the new pump, but there's still no pressure. The new pump required me to re-wire on a new electrical connector. I believe i did that correctly since the gas gauge works and when i turn the key on, the pump hums. When I have the fuel lines disconnected from the pump and turn the key, the pump hums but nothing comes out at all. The tank is half full.
#2
pump may be wired backwards. the big wires to the pump and smaller to the sender... but maybe the pump is spinning backwards?/?
returnless fuel system or does it have a return line to the tank? if it has a return line it will have an external fuel filter. it should be changed when a new pump is installed.
hard to recommend anything on the wiring without knowing the pump you have....any wiring diagrams for the new pump?
returnless fuel system or does it have a return line to the tank? if it has a return line it will have an external fuel filter. it should be changed when a new pump is installed.
hard to recommend anything on the wiring without knowing the pump you have....any wiring diagrams for the new pump?
#3
pump may be wired backwards. the big wires to the pump and smaller to the sender... but maybe the pump is spinning backwards?/?
returnless fuel system or does it have a return line to the tank? if it has a return line it will have an external fuel filter. it should be changed when a new pump is installed.
hard to recommend anything on the wiring without knowing the pump you have....any wiring diagrams for the new pump?
returnless fuel system or does it have a return line to the tank? if it has a return line it will have an external fuel filter. it should be changed when a new pump is installed.
hard to recommend anything on the wiring without knowing the pump you have....any wiring diagrams for the new pump?
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Joe_The_Guy
1999 - 2006 (GMT800)
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October 27th, 2021 6:28 PM