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Starting problem W4500
OK, maybe you guys can help me out here. I have a 03 Isuzu NPR HD (W4500) with a GM 5.7 gas motor.
After the truck sits for any time longer than 20 mins, I have to crank it 6 or 7 times to start it. Once it starts it runs perfectly under all conditions. Fuel filter replaced, no change. I suspect it a fuel related problem. As if the fuel system is loosing its prime and it takes 6 cranks to re prime it.
Its in the shop now and they say its the fuel pump.. no question. Sounds reasonable, but the truck hauls ass pretty well for having a bad fuel pump. Quoted $500 parts and labor.
Any thoughts?
2020 GMC Canyon Diesel
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Sometimes the pressure check valve fails in the pump.
When this happens the fuel drains all the way back to the tank.
It causes long cranking because the fuel has to be pumped all the way from the tank to prime the system.
Sounds like a proper diagnosis, and price is also in the ballpark.
Are they using factory or aftermarket replacement parts?
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Thanks Rabbler. Yes, based on what you are saying, the diagnosis does make sense now. I don't know if its a factory part, or even if the pump is Isuzu or GM. 4 days to get the part so Im guessing factory part. Im going to find out tho.
2020 GMC Canyon Diesel
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