SOLVED: I have a 78 350 Big Cam Cummins engine. It is

Detail: I have a 78 350 Big Cam Cummins engine. It is filling the FUEL Filter with antifreeze and also getting into radiator. The truck will run with fresh fuel in the filter for about 3 seconds and then die
Detail Question SOLVED: I have a 78 350 Big Cam Cummins engine. It is

Solution: Sounds like you have a leak on the fuel heater that is done by the water system. there is a seal and if this goes it will feed with water. but you will need to take the hole unit of to get to the seal and change it. will need to separated. to get to the filter. on the fuel injector pump. , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck! , That red wire is only for the fuel heater.will not cause a no start.try pumping the primer pump on top of the fuel flter hsg. but first open the bleed screw,which is black plastic also located on the top.this will eliminate any trapped air that might have entered the fuel intake system.if the pump does not get firmer and harder to push, then you have a leak in the fuel supply lines or the ck valves in the fuel filter hsg or stuck open. Still no start have it scanned to ck fuel pressure while should be close to 5000 lbs , Hi! It seems your fuel pump fails at idle speed. I would first ensure that fuel pump is well fitted, no leaks, and good diaphragm condition. , It sounds like it has a high pressure oil problem. does the oil pressure gauge come up while cranking? does it start when cold and not when hot? any check engine light? , Bump the engine with the in line cracked on the injector pump. Bumping the engine will cause the lift pump to run for 20 sec. or so. Once you have fuel to that point, crack the 1, 3 and 4 injectors and crank the motor in 10 second intervals, leaving 5 or 10 minutes between to let the injector pump cool. The motor will eventually turn over. Have a second person on hand to tighten the injectors when it starts because they can spray a considerable amount of fuel. When you're finished, I'd consider testing the fuel pressure at the filter by using one of the provided test ports. You should have around 12 psi at idle. If not immediately change your lift pump and follow the same bleed procedure. , The 3 psi is caused by a failed transfer pump. The problem the loss of could be the VP44 injection pump. This pump should be run at min 7psi. I had the same fuel pressure problem. I replaced my stock transfer pump with a FASS DDRP from The stock pump is over $200 to replace and will fail again, sometimes right out of the box. The DDRP will supply about 15psi to the pump and is simple to install. I hope this helps.

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