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Old 01-21-2011, 09:16 PM   #1 (permalink)
joefoe53
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C5500 fuel issues p1093

Hello
I'm working on a 2005 topkick with a 6.6 duramax. The guys before changed the fuel lines to hydraulic which are about 3/8 with 1/4 inch fittings... Truck runs like crap and wont drive. I saw that up close to the motor there is a half inch line. I went looking to find a half inch line and could not find one unless I buy from chev which way to expesive so I put 3/8 all the way back... Truck ran for a bit and now it's in limp mode throwing p1093 and won't go over 2000 rpm also the primer plunger is stuck down with suction... What should I do??
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Old 01-21-2011, 11:03 PM   #2 (permalink)
turnpike
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If my memory serves well, the 5500 should have a lift pump in or near one of the fuel tanks. Check it out.
It should run decent until you get your foot all the way into it. Even the small lines should provide a reasonable amount of fuel. Primer stuck down sounds like a lot of vacuum in the system.
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Old 01-22-2011, 06:00 AM   #3 (permalink)
ronjhall
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Fuel is sucked from the engine back to tank. No lift pump at back. A leak anywhere in the lines will cause fuel not to flow (sucked) from CP3 back to tank. Fuel filter may need a rebuild. Here is a rebuild kit for the filter head. Fuel Filter Head Rebuild Kit.
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Old 01-22-2011, 11:04 AM   #4 (permalink)
joefoe53
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Fuel filter is new all lines are tight no air in system that I know of, but he did have the sending unit pipe for the main line rewelded as they rusted and leaked.. Maybe the I.d. Of that is to small... The truck only has 65,000 km on it... I'm thinking of putting a inline fuel pump that might help any one know where to find a cheap one that will work
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Old 01-22-2011, 01:36 PM   #5 (permalink)
DRCook
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I have a service manual on CD and included is the Topkick. Everything points to not enough fuel being delivered to the pump and that there could be restrictions in the fuel line (ie: 3/8" -vs- 1/2").

For my 2 cents worth, I would surmise you are going to end up returning the fuel line to the stock size for the entire distance between tank and pump.
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Old 01-22-2011, 02:53 PM   #6 (permalink)
joefoe53
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Yes I believe that the problem too, the only thing is finding half inch fuel line I have looked everywhere the only way to do it it's to buy everything from GM...
Thanks for the help tho
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