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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Running rough, suspected vacuum issue.

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Old Oct 20, 2017 | 05:36 PM
  #16  
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Did I stump you guys???
 
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Old Nov 5, 2017 | 08:50 AM
  #17  
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I decided to try some seafoam, even though I think the quick fix cans of whatever are usually a gimmick. I put some in the oil, some in the gas, and some in the vacuum lines. After I did that, it was starting after running, and it seems to be running a bit better, but still not perfect. Maybe I have stuck valves when it gets warm or something? When it was sitting it was taken apart, and the valve cover was off with a garbage bag over the engine.
 
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Old Nov 5, 2017 | 01:40 PM
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You need to get a handle on the true fuel pressure. The engine will not run with 0 PSI per your previous post of fuel pressure.
 
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Old Dec 19, 2017 | 06:57 PM
  #19  
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Does anybody have any ideas? I need to get this truck going
 
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Old Dec 19, 2017 | 08:16 PM
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Originally Posted by Ryan313
Does anybody have any ideas?
You need to get a handle on the true fuel pressure. The engine will not run with 0 PSI per your previous post of fuel pressure.
 
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Old Jan 7, 2018 | 01:16 PM
  #21  
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Originally Posted by rla2005
You need to get a handle on the true fuel pressure. The engine will not run with 0 PSI per your previous post of fuel pressure.
When it rains it pours, but I was finally able to get a chance to test it.

Key on engine off it is 20 psi, and starts. If I cycle the key I can get it up to 53 psi before starting. I can also start it if it is at 20 psi, and it goes right up to about 50 psi. Hitting the throttle it goes up to about 53 psi. I drove it down the road and it held pressure the entire time. When I got back I shut it off, no start. It still had 53 psi when I was cranking it and no start.
 
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