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Airlocked injector pump (re-posted)

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Marc Simard

10-27-2000 06:12:23




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Hello,
I have some serious trouble with my 1970 oliver 1355. Its a recent rebuild with almost everything reconditioned including the injection pump. The problem is, every oh say 20-30 hours or so it just wont start. I then go through the bleed ritual and there is always air in the pump that bleeds out through the damper vent. The engine never stalls or misses when running. The Inj. pump has no fuel leaks I can see. The fuel pump is the only item that I didnt replace, and it has a tiny sweaty leak around the inlet from the tank. The only constant between all the times it has done this is that the fuel tank is very low. (1 inch over the outlet).
Any ideas?
Thanks.

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Michael Az

10-28-2000 08:26:53




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 Re: airlocked injector pump (re-posted) in reply to Marc Simard, 10-27-2000 06:12:23  
About a week ago I had the same problem with my Cummins. I discovered the gasket had gone bad on the fuel filter. Wouldn't leak fuel, but would pull air.----- Michael



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T_Bone

10-28-2000 02:31:35




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 Re: airlocked injector pump (re-posted) in reply to Marc Simard, 10-27-2000 06:12:23  
Hi Marc, Sounds like a suction leak to me or a high pressure fitting leak. Hydraulic's will get air in the high side without showing leaks. Sounds weird but true! Use a heavy concentration of liquid dish soap for leak detection and it will suck in the soap while running and blow bubbles while off under pressure. I use just enough water with Dawn dish soap to spray threw a bottle.

T_Bone



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Jim K

10-27-2000 17:00:32




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 Re: airlocked injector pump (re-posted) in reply to Marc Simard, 10-27-2000 06:12:23  
Marc I had an air problem on my F350-7.3 diesel
I kept getting air in the system but could find no visible leaks.After about a year of frustration I finally found the problem. I had a fitting that was suspect so I changed it but it never leaked visibly. What was happening I believe is that when I shut the truck off the fuel
would contract (this was in a return line)because it was warm and would suck in air. Enough to make for agravating starts and alot of white smoke.
Changed the fitting and aint had a problem since.

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