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Return fuel is very hot.

I have a 2001 isx 600. The fuel returned is very hot. To the point that once it reachs a surtain temperature the truck starts running really bad. Deregulation occurs. LOW FUEL PRESSURE is the flash code. Note when fuel is cold truck runs great. Usually only occurs during summer when outside temp is above 80. Any ideas?

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The heat in the fuel is the result of the increased fuel pressures that are achieved at the tip of the injectors. Engine manufactures have done this by design to get increased performance and a better atomization which gives a more complete burn. Most trucks return fuel to both tanks. If this is the case on your truck the best suggestion would be to install a cooler element with a fan mounted on it that you could turn off and on manually. I have thought about doing this with my truck.''italic text''

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My logging truck has a 565 ISX ,and it has a fuel cooler under the rad ,down by the bumper ,I thought it was the tranny cooler till I got a rock threw it one day and fuel was running out onto the ground ,may-be yours is plugged with road grime?

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Thanks blackwood for your comment. Im looking for anyone that has had this problem. I spec and had truck bulit back in 2000 rec'd truck. The truck has perfect until 2007 when USLD was interduced into the industry. At that point I started noticing the fuel tanks where warmer than normal. Then check engine light would come on later on in the day when the fuel really heated. To the point it would "blacken" the fuel. So for 7 years truck run great then USLD comes out and during the summer months the fuel gets really heated. I have about 7 months a year that the truck never flashes a code. The spring/summer comes in and I have about 5 months of this. Its been going on for almost 5 years. Over about a year back in 2008 I replaced ever single part that was serviceable on the fuel system. Including the supply lines 1/2 to 5/8 and the water fuel seperator. It has many scrathing there head. It seems when the fuel reaches about 90 degrees it breaks down somewhere along the line and engine dereg's. Just been driving it that way for the last 5 years. I have noticed that when I clean and filter my waste oil and add a gallon per tank it seems to help I have added 4 gallons to 250 once and it ran very well. Fuel was not nearly as hot. Any thought?

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Might be something to run by Cummins and see what they say. I don't see where putting waste oil in your fuel would cause the temperatures to go down but if it works carry on.

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I wonder if there is an ECM setting that can be changed to allow for hotter fuel before de-rating.

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I have a 2001 Volvo with a 475 ISX with the same problem. Hot fuel then low fuel pressue code. Only when its warm outside. The code starts coming up coasting down hills with the jakes on. Then gets worse and de rates the power as the fuel gets hotter. I havent been able to cure the problem for 2 years. If you figure out the problem please post the fix.

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i have an 02 international with an isx and have same problem. When i run lucas fuel additive it helps, i put a fass system on which helped a lot but if its close to 100 and im in the hills i still get code. Then i put on a fuel cooler and that seems to get the job dun.

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bscornett will be eternally grateful.
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