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would not start, changed fuel filter, starts, but starts hard. takes about 10 tries.
starts on first try when warm.
i have the 1995 service manual and it says it could be air in the fuel lines because of the filter change( yes, i did fill the filter with fuel).i opened the bleed bolt, pumped the primer, saw fuel, did not hear air or see bubbles. still hard starting.
the manual says it will bleed out small amounts of air on its own, so i drove it for 20 minutes, and have let it idle for an hour, still not fixed.
the manual also shows how to bleed at the fuel injection pump and the high pressure fuel lines, is this necessary?
and how do you know if you got all the air out when bleeding at the bleed bolt? do you see bubbles in the fuel, or hear air?
i have worked on gas engines, this is my first diesel.
Like the manual says the system is self bleeding so if after 30min of driving it still has the same symptoms, look elsewere for the problem. You could have a leaky fuel line letting air into the system, or more likely you have a fuel pressure deficit. I suspect the overlflow valve or the fuel heater is letting air into the fuel.
i dont want to sound like i am arguing with you, just want to understand this.
why would a overflow valve or the fuel heater cause it to start hard, but not cause it to run poorly? i mean, air is air, why does the air disappear after the truck starts and only appear when the truck is cold?
also, i dont see a "test for air leak" or a repair procedure in the manual for the overflow valve or the fuel heater, just removal instructions.
is there a way to test these? or should i just replace them?
just went out to start it, tried the primer, no resistance. pumped it 30 times, still no resistance. then it started in 3 tries instead of 10. does that mean when it shuts off the fuel drains, the air gets sucked in, and now it needs to be primed before it will start ? priming chases most of the air out?
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