ok so ive got a 91 7.3 with an E4od, 175k on it. only thing done is a shift kit, the truck has recently started to stall when you abruptly let off the pedal if your coming to a light and let off it dies, but if you just roll out of the pedal it will be fine. if you hit the key it will turn right back over so its not sucking air. Ive got the idle set a little high right now to try and prevent it from happening but it still happens every once in a while, Fuel filter was just done in june, im thinking its the lift pump but am not 100% sure as im not the greatest with diesels.

so is it the lift pump? if not what could it be? if it is whats a good replacement?

 

Do you use any fuel additive? This fuel now does not have much lubrisity to it. It sounds like your injector pump is sticking. Try removing your fuel filter, drain it, and fill the filter with Diesel Clean, Howes or some other additive. Screw the filter back on and start it. It might run rough for a short time. Add a double or tripple dose of additive to our fuel tank, by the time the tank is used problem should be solved.

 

i use power source, is there anything better?

 

I haven't heard of power source, but that doesn't mean much. I have used Power Service,and Howes for antigelling. Currantly I use 2 stroke motor oil for lubrisity. One oz. per gallon of fuel.

 

maybe it was power service i dont remember exactly, its the stuff in a white bottle.

 

last i knew diesel kleen was rated #1 out of all the additives you can pick it up at about any parts store or even walmart

 

Diesel Kleen is in a silver bottle every place I've seen it.
I found it at Wal-Mart as rupejosh said.

 

Diesel Kleen comes in both white and silver bottles.
One with anti gell for winter use and one without anti gell for summer use.

 

Do you know which-is-which?

 

Silver bottle for summer.
White bottle for winter.

I had them in order in the last post, but I forgot to specify which was which.

 

SHOOT!
All I have is the silver one.

 

With the way modern fuels are blended, the only time I worry about gelling is a sudden artic front that drops temps well below normal suddenly.

Yes, I use the white bottle in the winter, and I increase the dosage when temps suddenly drop below zero because if it snows or we have ice I have to be able to go as soon as the phone rings.

 

I'm not sure if we ever get the winter fuel blend here as it rarely stays freezing all day long.
I've never had trouble except while elk hunting once and even then my Cummins just ran crummy until it got warmed up, actually really crummy.
When my Dad owned it he had the fuel line freeze-up once in really bad NE Oregon weather so I bought 2 cans of anti-gel when I bought the truck from him. They're 12 years old and I've never used them.
I THINK the grid intake air heater and the direct injection are benefits to starting in cold weather though.
We'll see how the DI/glow plug Powerstroke and IDI do this winter.

 

I can't really say what the modern ULSD does when it gets really cold, like well below zero.

I can tell you what the old stuff did back in the 70's and 80's though.

When I was running out of Colorado there was a truck stop that sold #3 diesel in the summer, real cheap stuff back then.
But the engines just loved the stuff, great MPG and lots of power since it was a heavier fuel.

One day in 1980 I rolled out of Denver, 90 degrees and sunny with a reefer full of swinging mutton.
That night the temp went into the basement.
I pulled into a rest area in eastern Kansas for a few hours of sleep, reefer running and truck running.
Woke up two hours later, dead quiet nothing running, 15 degrees outside.

I looked in the fuel tank, it looked like icebergs in there with all the parrafin that had gelled out of the fuel.
Trucks were stalling driving down the road left and right, fuel gelled up.
Took almost two days to get mine running again, took a service truck with jumpers and a torpedo heater blowing hot air on the fuel lines and tanks to melt the parrafin, 10% gasoline was added to the fuel to keep it that way.

Never did get the reefer started, and I was worried about the mutton freezing, which causes it to turn black and trash the load.
So I was off at a high rate of speed for NYC.

Temps stayed close to freezing the next day, and the box temp was inching lower.
Finally at Angola Indiana it went down to 31 degrees in the trailer, I had to do something.
I pulled into a 76 truck stop, got in the garage.
We tried blowing air through the fuel lines, plugged solid.
I pulled the drain plug out of the reefer fuel tank, nothing came out.
So I sat there with a coat hanger, poking the parrafin out of the drain hole so I could get some #1 diesel and gasoline in the tank.

After a couple hours in the warm, we finally got the fuel lines clear, change the fuel filters on the reefer unit and got it started again.

The load was saved, I delivered two days late, but I did deliver.

That was the last time I have ever been caught like that, lesson learned.

If the temps have been warm and are usually warm at that time of year, if you go someplace where it is colder than normal, get some antigell addative in the tank ASAP.
A couple dollars worth of prevention can save you a pile of money and headache.

I could have run 15 gallons of gas in each tank, 200 gallon tanks and been fine.
The reefer had a 75 gallon tank, 7 or 8 gallons in it and I would have been fine.

I probably had close to 1000 dollars in service truck and shop time before I was back to normal, 30 dollars worth of gasoline could have prevented it all.

There was a discussion about the cost of lessons and how well you learn something.
I will never forget about gelling fuel again.

 

The newer fuel gels easier. The first winter the stuff was out our trucks (class 8) gelled left and right. They can't blend it with #1 because #1 has too much sulfur, so they have to use anti-gel additives; which aren't as good as just plain old blending.

Anyway - the best anti-gel additive is Howe's - get it from a any major truckstop. I've used PS and never had any luck with it. That said, if you know it's gonna be cold blend your fuel, all the way to 50/50 if you have to and skip the additives. No better insurance policy. If you can't find #1 diesel use kerosene, but no more than 25%. Gasoline will also work if you're really in a pinch.

This probably doesn't apply to most members because they're smart enough not to live in such a cold place as I. When temps are below zero is when you are gonna have problems.