Very Bizzar Problem...

Hey Guys, Sorry I have been away for a few days, I have read all the responses. I just brought it back to CAT and had them flash the ECM for for laughs, the mechanic said that was not going to fix the problem.... He was right. He also noted any type of electrical problem would show a fault in the ECM as well and he is convinced that this is a mechanical problem, just not sure what or where.

I have had the truck for several years and this is a somewhat new problem, that seems to becoming progressivly worse. When this issue first started showing up, it was just happening on the high side of the super 10 in 8th and 9th gear, now its starting to become a problem in 10th and yes only at or around 1500 RPMS. I was behind the truck last night following my driver to CAT, when he hit the problem RPMs I seen the truck was blowing raw fuel out the stacks, not a lot but I could smell it and see a little smoke.

Just another note, this is not alawys consistant although it happens more then it does'nt and it seems that once your in the gear and make it past the loss of power and ride that gear for a while and than let it fall under the 1500 mark it usually will run just fine thru the 1500-1600RPMs.


The trans would be a great idea, however its the sputter in the fuel (as if it was out of fuel) and the drop of the turbo pressure indicate a fuel issue, I could be wrong, I just wish I could find a solution, this is getting very expensive going back and forth to service.

I am not sure where the "Fuel Pressue Check Valve" is located sounds like a good place to look as long as its not he same valves that are above the fuel filters, can anyone confirm where this part is located?

Please guys, keep throwing out your ideas, please dont think your idea maybe stupid and keep it to yourself. I am open to any suggestions !!

 

Well today was the day.... My driver was coming up from Atlanta and the truck made a freakish sound like it was out of fuel, he got off the ramp thinking he was about to run out of fuel, pulled into a truck stop, got to the fuel island shut it off dipped the tanks and there was still a good 2/12 to 3 inches of fuel. Went to start the truck and nothing... the motor just cranks. Tried to spay either and nothing at all. checked the fuel filters to make sure there was fuel in them and there was.

Towed to the nearest freighliner dealer, I guess I should here something tomorrow. Any ideas While I am waiting here chewing off my finger nails to hear what the problem could be?