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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Detroit 6V53

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farmerjoe

11-28-2004 13:15:46




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I was wondering what could cause the motor to stop running after about an hour or so? It runs great and then after an hour it just dies almost like a vapor lock. I have added an assist pump to it but did not help.

Thanks
Chad




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chip man

12-19-2004 17:27:36




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 Re: Detroit 6V53 in reply to farmerjoe, 11-28-2004 13:15:46  
If the fuel pump shaft seals are worn, the pump will suck air in there if the tank vent is restricted.



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Kent of SW Mp

11-30-2004 06:35:30




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 Re: Detroit 6V53 in reply to farmerjoe, 11-28-2004 13:15:46  
Could be the transfer pumps output goes down when it warms up. My 2 cents.

Kent



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Nat

11-29-2004 13:24:48




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 Re: Detroit 6V53 in reply to farmerjoe, 11-28-2004 13:15:46  
Had the same problem on my Ford 555 backhoe for the last couple of days. I replaced the fuel filter and it ran for an hour or so and the died,like it ran out of fuel. I disconnected the fuel line and no flow. I blew trhu it and flow started, then after 1/2 hour it deie again. To make a long story short so kids stuffed a rag down in the fuel tank, had to get it out



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NC Wayne

11-28-2004 20:01:25




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 Re: Detroit 6V53 in reply to farmerjoe, 11-28-2004 13:15:46  
Both Marlowe and RAB make good points and I have seen both of the things they describe happen. On the V series engines there is supposed to be a restrictor type fitting on the left cylinder bank fuel return fitting, to keep system pressure up. Check to see that it is still there, and if not put one in. Also there is a spring loaded relief valve in the pump body that may be popping due to some type of restriction on the pressure side ( trash clogging the orfice I just mentioned, etc) and then not reseating. Now, you say you put an assist pump in line to it. I'm assuming that happened after the problem started. Now, my question is how much discharge capacity does that pump have, and is it enough to cover or exceed the attached pumps capacity? The fuel pumps on a Detroit are positive displacement, gear type pumps, so in all actuality the pump you have can not supply fuel to the engine while the OEM pump is still inline. Being a gear type pump the only way for fuel to go through it is if it is turning, which means your pump can assist only as long as it is always supplying full capacity or more to the OEM pump at the highest RPM you plan to turn, otherwise once the OEM pump exceeds that capacity it's gonna starve and burn up from low flow/cavitation/etc, if the engine doesn't shut down first. If the OEM pump is damaged in some way (ie-not turning due to the driver ears sheared off, etc) your pump definately isn't gonna pump enough the fuel through it to supply the engine because the only passages through it are the few thousands of clearance that every gear pump has to have to operate, or at most the excessive clearances that may be present due to the pump being worn out. My suggestion is to take the OEM pump out of the loop and check it. I don't have it in front of me but there is a spec of how much fuel it should pump in a given amount of time. Then too you might want to see if your other pump will work to keep it running hooked up direct. These old Detroits can be cantankerous sometimes, so let us know what you find.

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marlowe

11-28-2004 19:03:25




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 Re: Detroit 6V53 in reply to farmerjoe, 11-28-2004 13:15:46  
on mine the rubber fuel hose would get hot and get soft and would suck shut after a hour in hot weather and hour and a half in cooled



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RAB

11-28-2004 14:49:48




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 Re: Detroit 6V53 in reply to farmerjoe, 11-28-2004 13:15:46  
Is the time it runs (at full load) inversely proportional to how full the fuel tank is? If so, it could be a blocked fuel tank breather causing your problem. Let us know what you find.
Regards, RAB



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