Fuel temp high waring while towing

[Antonm]

I have an 08 F-350 DRW with Spartan 210 tow tune. While towing my 12000lb toy hauler the other weekend (first tow trip since installing the Spartan) the fuel rail temp alarm went off. I reset the alarm setpoint to get it to shut up but the temp stayed either just below or just above the recommended alarm most of the trip. Checked the little coolant tank in the fuel cooling system, level was fine, even added a little water to bring it up to the top of the sight glass (less than ounce).

Any insight on this and how to get this temp any lower???? Is this a common problem ????? Towing 12k with this truck shouldn't be over-tasking it.

[53 willy]

Im guessing the small electric pump that pumps the coolant for the fuel cooler and the vgt cooler has gone bad or isnt getting power, its on the fan shroud on the left side on the bottom, kinda a pain to get to but thats where I would start. What was your temp, are you sure it was out of line and not just the dashdaq set to low of a temp.

[Antonm]

Temp usually hung out in the low 150 range. Is that "out of line" ?????

[53 willy]

Ya I would say that is hot, its been awhile since i looked at my fuel temp but I was thinking it was usually in the 110-115 range, I will look tomm if I can remember, fuel temp really shouldnt change if its loaded or not. I would say your coolant pump isnt working. You should be able to feel it running when you touch it. If you change it I have had a heck of a time getting the new one to prime, there is a certain procedure for priming it and it sucks.