Between Omaha and Des Moines, 7 miles South of I80 | bleedred - 1/9/2015 15:34 Have a 2001 KW T800 with a C15 and sometimes the fuel bleeds back and makes it hard to start. It only does it when it is less than 1/2 full of fuel. Never does it when it is full. But it does it randomly when it's less than 1/2 full. Any ideas what to check? Makes for a bad day when it does it and it's cold out! Takes several 20-30 sec intervals cranking it over to get it running. 1: Makes sure it has a hand priming pump, on the secondary fuel filter base = that has two additional one-way check valves inside and it helps "hold" fuel in the system. 2: Change your fuel return check valve, and don't overtighten the new one; needs only to be snug.(red arrow) 3: Some worn fuel transfer pumps (lift pump) can allow a small amount of air, to get into the fuel system, thus allows the fuel to possibly drain back to the tank and that creates an air pocket, which makes the "next start-up" hard to get fuel pressure built up to help injectors fire. (you need quite a few "test sight glasses" to actually t/s this exact problem, and let engine set over night) You may just want to install a new one, verses paying for mechanics time and trouble-shooting dollars, if doing your own repair = that's your call 4: Sucking air somewhere = need to get test equipment, on engine and troubleshoot. (Small possibility of injector seal problems and seating problems, too, but this are rare) Again, a number of fuel sight glasses help find the problem and fuel pressure gauge/s.
Edited by 4WD 1/9/2015 16:14
 (Later 3406E _C-15 fuel filter base design_right photo_in paint program.jpg)
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 Later 3406E _C-15 fuel filter base design_right photo_in paint program.jpg (34KB - 895 downloads)
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C15 fuel bleeds back...
