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Old 03-15-2014, 03:23 PM   #15
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Will do thanks!
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Old 03-15-2014, 03:26 PM   #16
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Sounds like fuel restriction, you changed the lower filter but did you change the upper on the motor? Just noticed you have a cummins, probably different set up than the isuzu.
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Old 03-15-2014, 05:52 PM   #17
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Well $217 dollars later...Fuel/Water separator filter, secondary fuel filter, air filter and a belt for good measure...... I didn't need the belt, but wanted to have a spare.

Will replace first thing tomorrow morning. Having a glass of wine to dull the pain. Had to cancel all my plans..... Oh well, the bright side is it crapped out close to home and kept going until I got there! Called Good Sam and have a tow scheduled for Monday a.m. If they are as good as everyone says, I will up my 1 yr to a 3 yr membership!

I am hesitating on how far I should go in trying to fix this or just let the professionals deal with it. I am no where near mechanically inclined! The only thing that keeps me going on my own is the fact that every $ I spend on paying someone to repair it is one less $ for rehab! I do fear though replacing all this stuff and it being something that I never would have thought of.....

Thanks again for all the help!! Will let you know how it goes tomorrow!

ON the bright side, I was going to cut a hole in the bedroom floor to be able to access the fuel pump if ever needed..... That can easily be done at this point of the reno. Only issue is how to cut it and frame it that a door/hatch/access panel will fit and still be structural.

Thanks again!!!! This forum is great!
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Old 03-15-2014, 06:08 PM   #18
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If this is/was a diesel, I don't think there ever was a fuel pump at the tank. It would be engine mounted. Check that out before cutting holes in the structure???????????????

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Old 03-15-2014, 08:35 PM   #19
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Dave; it is a diesel. Cummins 6BTA, it has a lift pum and a fuel pump mounted on the engine. I have ti reach up around the tank to make sure there isn't a tank pump as well. Thanks!
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Old 03-15-2014, 10:10 PM   #20
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Diesels are pretty simple. To run they need compression, heat and fuel. Because you are running and showing normal boost and don't have a significant internal problem like a broken piston or something, I would assume the compression and heat are there. As mentioned by others fuel is probably the culprit.

In checking for fuel most people look for plugged filters but another culprit is air. A poor seal on the filter or fuel line connection will allow air into the system and cause power loss. Also a plugged or restricted return line can cause power loss. At a shop I worked at we had bunch of air leak problems that turned out to be a shipment of filters with a defective crimp on the base to can. Caused a lot of head scratching.

You might disconnect the return line somewhere after the injector pump and connect a clear plastic tube to run into a bucket. Start the engine and look for a good flow with no air bubbles. When you change the filters see if they are full to the top with no air space. Sometimes this is hard to do depending on where the filters are mounted. With new filters check your return line for bubbles and compare flow.

It is usually something simple just hard to find. Good luck.
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Old 03-16-2014, 01:11 AM   #21
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Cummins will use a lift pump, in pickup trucks it is inside the tank, motor home I don't know.

Fungus can grow in the tank and plug and or take out the lift pump.

If the lift pump goes, or if fuel is otherwise restricted, the much more expensive injection pump will fail as the excess bypass fuel is what cools the injection pump.

I have seen pounds of biomaterial growing in diesel tanks.

This may not be the issue, and chances are it isn't the issue, but be aware just in case.
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Old 03-16-2014, 01:14 AM   #22
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On review, a 91 may not use a lift pump, I am not for sure, but fungus may still be an issue,
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Old 03-16-2014, 11:41 AM   #23
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Fungus can grow in the tank and plug and or take out the lift pump.

I have seen pounds of biomaterial growing in diesel tanks.
Algae, actually. Algae only grows in diesel tanks that have water in them from condensation, and only if the fuel sits long enough for there to be a water/fuel separation. It doesn't matter if it's biodiesel or regular diesel; same thing happens in both cases.

Two general solutions to prevent this from occurring: (1) add a biocide to the fuel to kill any algae. Which leaves dead algae in the tank to clog your filters, and does nothing to get rid of the accumulated water; and (2) a recirculating pump to take fuel from the tank, pass it through a fuel-water separator and a filter, and dump it back into the tank. Which removes the dead algae and any water.

Algae accumulation is common in diesel tanks that aren't used often, and almost unheard of in tanks that are regularly used.
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Old 03-16-2014, 03:40 PM   #24
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Thanks for all the suggestions!

Was unable to remove the filters. Tried with a filter wrench and both wouldn't budge. So after much consideration and the location of the moho (fenced in storage lot with no room to get a wrecker in to pull it out) I decided the only viable option was to leave well enough alone. If I somehow mess up the filters during removal or something else it is dead in the water with no way to move it. At least this way I can pull it out of the lot to where a flat bed can get it.... I also find it hard to believe it is the filters. I drained the water separator again and it is clear and bright. I would also hate to be an hour into the trip and have it crap out again because I bumped a solenoid, or connection enough to get it to run O.K. for a little bit.

If there was a Walmart close enough I could get to by doing 20 mph I would almost consider driving it there and try changing the filters again. That way if I mess something up then the wrecker can get it.

I am on a time restriction with getting time away from work due to the only two other folks in my department being transferred in May and I will be on my own till July. So it either gets fixed and delivered in the next two weeks or it has to wait.

So the only choice is to take money out of the reno budget for the repairs.... Besides beds and chairs are over rated.

Air filter wasn't bad but replaced it anyway since I had to get something done. It is a bad work day when changing the air filter is your only accomplishment.
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Old 03-16-2014, 05:32 PM   #25
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It may be true that the funk that grows in the tanks is not fungi, it is my understanding that algae as a plant requires sunlight to grow. So without exercising the benefit of research I decided to go with fungus. I may. E mistaken , but the general gist is crap can grow in the tank, and it seems that by the op description that fuel may have been in there for a long time.

I doubt it would show in the filters unless poisoned, but it will block the hell out of a pickup sock.
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Old 03-16-2014, 09:17 PM   #26
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I think I'm having the same or similar problem with my Isuzu. Some times it runs fine but when I first put a heavy load on it after a rest stop it will bog down and may even quit. After holding it at 2000 rpm for a couple of minutes it will clear up and run ok... usually. Changed the little fuel filter (PF13) and it ran great until the first rest stop. I'm in Florida (1150 miles from home) and need to find the problem. Water separator looks fine and both filters were changed before leaving home. Could a clogged filter be intermittent? This is an '85 and I don't know if it has a lift pump in the tank? Should I change the PF13 again? Or change the Racor water separator filter again? It got very few miles in the last 8 months before this trip... just driving it to and from places for service.

Any help would be greatly appreciated.
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Old 03-16-2014, 09:28 PM   #27
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My guess on the Isuzu might be that air is getting in the lines after a hard run and stop.

Just a guess though. Could be a "hot leak", very small, but enough to let a little air in the lines.

If your Isuzu has rubber return lines on the injectors I would start looking for small cracks there, and or the ends of the lines running to filters etc.
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Old 03-16-2014, 10:32 PM   #28
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I think I'm having the same or similar problem with my Isuzu. Some times it runs fine but when I first put a heavy load on it after a rest stop it will bog down and may even quit. After holding it at 2000 rpm for a couple of minutes it will clear up and run ok... usually. Changed the little fuel filter (PF13) and it ran great until the first rest stop. I'm in Florida (1150 miles from home) and need to find the problem. Water separator looks fine and both filters were changed before leaving home. Could a clogged filter be intermittent? This is an '85 and I don't know if it has a lift pump in the tank? Should I change the PF13 again? Or change the Racor water separator filter again? It got very few miles in the last 8 months before this trip... just driving it to and from places for service.

Any help would be greatly appreciated.
That definitely sounds like an air leak. Since you just changed the small filter with no change I would look at the Racor. Let it sit for awhile and remove the cover of the Racor and see if the fuel level is all the way to the top or if there is a small air pocket. The engine will clear a small amount of air at start up, run ruff until the air runs through the system. Check the cover gasket and make sure it's seated well and make sure the o ring on the cover "T" handle hold down is in good condition. Also next time you park for while like at a rest stop, before you start reach down and pump the hand priming pump on the side of the engine. If it starts out soft and stiffens up after several pumps you just cleared the air and are pumping straight fuel. Pump several more times to make sure all the air is clear and screw the pump handle down snuggly, this can also bleed air. Now start the engine, if it runs normally you found the problem.
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