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We have had this problemo for a long time now and cant come up with a fix. I dont know if this is the right place to post, as I didnt see a fourm for f650s? The motor is a Cummings ISB225(I believe). It seems that some times it runs just fine and more then none it runs like a rouf idel. Its like the motor fluxuates alot up and down. It seems that maybe starving for fuel? I have no idea that. We have spent a lot of $$$$ taking to places and no one can come up with a reason whys its running like crap. When you go to shift gears it still does it. But some times when u are on the highway and get up to speed it drives just fine, like nothings wrong. We had the ecu replaced, took to Ford and thats what they said was the problem so we did that, work for a few days seemed like, then back to a rufffffffff running motor. Had the Alt changed bc we wer told that could cause the problem (which had a bad dioed). Didnt work. Im just at a end to were I dont know what to do are look, are think ..... Does any one have any suggestions to what it might be? Thanks again guys!!!!!
Anyone hook a scanner up to this truck and check for codes? Could be a dozen different things. I can tell you something it MIGHT be. Did you check the transfer pump? Could be the injector pump isn't getting enough fuel, and on the ISB series Cummins, fuel from the transfer pump cools the ECM. Low fuel pressure from the transfer pump will set a specific DTC. And, Cummins has an updated transfer pump kit for many ISB's. You really need to scan this thing and find out what's going on with it. Don't just throw parts at it.
We had a truck at my work that all of a sudden starting running bad. turned out someone had stuck a Candy bar wrapper in the fuel tank and it of course went to the pickup and plugs it up about 95%.
it would idle all the live long day, but when you stepped on the pedal it was gutless.
I'd look inside that tank.
ISB cummins in the F650 chassis are KNOWN for Lift pump (transfer pump) issues. Like Lousiville Joe said, fuel is drawn from the tank, through a screen filter primary inside the frame rail, through the transfer pump and then pushed thru the ECM cooler plate before it goes into the HP pump. When you key on, there should be an obvious noise of a electric motor working near the Left front of the engine for 10+ seconds (not to be confused with the brake booster on the firewall). If you hear nothing, or a noise that doesnt sound strong, or sounds erratic, replace the pump AND the Ford screen filter on the frame rail. That came back to bite a fellow co-worker at our shop before. The screen was plugged and no one knew the filter was there in-line and it took out 3 lift pumps before we realized what the deal was and that is was a filter element hidden in the frame rail. Everything your describing points towards the lift pump.
Lou Joe, We werent just trowning parts at it. I just was explaing that we have taking to many diferent shops EVEN FORD, and this is the stuff they have done to it thinking it was the problemo.. Scanig it means taking it to ford? Are runing a simple scanner?
The filter is located on the inside of the frame rail. Drivers side about midway point of the engine. Its inline with the suction line. Looks like a 3 inch round gas filter, but its a screen filter. Black with quick disconnect fittings in it
I see somethings thats about 3 inches its alum.. Fuel line does run to it, dont see disconnect fiting but does look like it might unscrew. It also does have a part of the harness runnig to it? Is this it?
Ok, after closer inspection. Doesnt unscrew. Has a hose on side unscrews, and a hose at bottom with a bolt that unscrew. Would this be it? This is all I see... And is this replaceable?
Ok, we have had the Fuel Supply pump, and fuel Injector pump replaced back in 07. We had that done and it did nothing to fix the problem. Note Young and Sons Auto is not a place to go if you are in Indianapolis!!!! Just keep saying this was bad and replaced it and still have the smae problemo :-0
I have looked every where online to see if I am looking at the right thing. google n all lol, cant find a picture are nothing about this inline fuel screen. Starting to bother me alot, please help guys, Even looked in the tech folder here. :-O
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..... Does any one have any suggestions to what it might be? Thanks again guys!!!!!
