HI have 98 gmc sierra k2500 4wd. Drove to work the other night and alt. meter was bouncing crazy. Alt. check done before and box store said it was fine. Also headlights pulsating.. anyway.....the next am(10 below O) the batteries were drawn down and had to jump start(block heater plugged in all night) truck ran then stalled and jumped it again...stalled again.checked fuel filter housing and was empty....lift pump not working...put meter on pins in connector and read like 0.03 or 0.5 v,,, jumped the pump with 12v(from batt. charger) and pump filled housing..truck ran until MT again. charged batt. changed out oil pressure sensor and even plugged in new pump and still nothing...At my witts end ??????? anyone
even if the rest of the truck has power ..ie glow plugs lights. it seems as the lift pump is the only problem.....worked on the way to work now nothing....?
The relay is good.....put new ops in .....even hooked up new pump to harness and still nothing.... checked fuses (thought they were good) and nothing......? ground in the harness? diagram for wiring circuit for lift pump? anyone ....gonna try 2 new batteries and check ALL grounds(if i can find them) and see..any suggestions helpful...thanks
even if the rest of the truck has power ..ie glow plugs lights. it seems as the lift pump is the only problem.....worked on the way to work now nothing....?
The relay is good.....put new ops in .....even hooked up new pump to harness and still nothing.... checked fuses (thought they were good) and nothing......? ground in the harness? diagram for wiring circuit for lift pump? anyone ....gonna try 2 new batteries and check ALL grounds(if i can find them) and see..any suggestions helpful...thanks