Question about 1985 Ford F 250
1985 ford diesel runs fine if you pour fuel in the intake throat. Runs fine if you start it every couple hours. After sitting overnight will not start can bleed it full fuel stream. Pour fuel down intake throat start right up and run fine. Have replaced filter, fuel pump thought thier might have been a check valve issue.
If it's a 7.3 they are notorious for sucking air at the fuel filter housing drain ****. There are I believe two small o-rings that seal the valve at the filter housing and those seals over time will deteriorate and cause air to be entrapped in the fuel system. The usual symptom of being able to start the engine every hour or so but when left over night ,,,,no start is classic. Hope this helps.
Posted on May 26, 2009
The check valve is a small brass fitting where the return line attaches to the filter head. I believe it takes a 7/16" wrench. There is a 'duck bill' inside that prevents fuel from leaking back to the tank causing air in the system. It should allow flow in only on direction. Some times you can see light through it if it's bad enough. Also, the lines between the injectors can dry out and start to leak air. Air will leak in before fuel leaks out, and you won't see it. There are plastic, cup-shaped connectors for these hoses that press onto the top of each injector. They are sealed by two o-rings on each injector body where it meets the connector. These o-rings can dry out and also leak air and fuel. Your Ford dealer or diesel service professional should have the proper o-rings. Any other o-rings might not seal, as they won't be the exact size. You already changed the fuel solenoid when you replaced the pump. It is inside. There has to be battery cranking voltage to it while cranking, and battery voltage with key in 'on' position. The wire attaches to the top of the pump. This is not likely to be the problem, since it restarts every 2 hours.
Posted on Jan 11, 2009
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