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Old 03-16-2014, 11:15 PM   #29
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Originally Posted by J. Morgan View Post
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.
Transition from metal to rubber at joints usually, but I once found instead of rubber looking tubes they had used wire braided over rubber and the rubber split with age and fuel couldn't be seen while sitting, but wire mesh got damp with fuel when I pressurized fuel with an electric pump.
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Old 03-17-2014, 12:51 AM   #30
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Dave,

I'm voting for a clogged fuel filter. I've got the Cummins/Allison in my 325 as well. The maiden voyage was going well until a total loss of power put me on the side of the road. Of course I had no tools, so took off my belt, and with a sheet metal screw between the leather and filter just to get some bite, managed to remove it. The filter was jammed with all sorts of stuff. Shook it out, flushed it with fuel, shook it some more, filled her up, re-installed it, and the engine came back to life. Had to repeat the process about 100 miles later, but made it home. My first major investment was a new aluminum fuel tank.

Charly
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Old 03-17-2014, 02:52 AM   #31
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Charly,

Thanks! I am starting to lean that way as well or the lift pump. The only issue is where they are located I can not get enough torque on them to get them loose. I mean I was starting to crimp the filter. Where did you get the aluminum fuel tank?
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Old 03-17-2014, 06:47 AM   #32
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Thanks Dan and J. I'll start looking for cracked fuel line on the filters and pump. Will also check the Racor seals. I have noticed that the hand primping pump doesn't feel really firm like it once did. Also the pump drips a little while priming. I may have a worn out priming pump.... has anyone change out one of these?

It's all part of the great adventure of owning and using a 30 year old machine.
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Old 03-17-2014, 12:03 PM   #33
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Tony6373,
You may already know this but there is a bleeder screw just in front of the primer pump on the isuzu. If you crack that screw open just a tad while you are pumping the primer, if there is a bit of air in the line after your upper filter change, it will sputter a little then straight fuel will start to come out. Then quickly tighten the bleeder. It may have a lock nut on it i cant remember. It worked for me.
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Old 03-17-2014, 04:11 PM   #34
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Charly,

Thanks! I am starting to lean that way as well or the lift pump. The only issue is where they are located I can not get enough torque on them to get them loose. I mean I was starting to crimp the filter. Where did you get the aluminum fuel tank?
Hi Dave,

I had the tank custom made at at friend's shop. That was a few years ago and I want to say that the cost was in the $700 range, but it will never rust out.
The fact that the filter is so tough to remove might be an indication of how long it has gone unserviced. It's gonna have to come off one way or another, either whole or in pieces.

Charly
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Old 03-17-2014, 07:08 PM   #35
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...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.
Oh I don't know. I've had days where just having time to change the air filter makes it a good day!
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Old 03-17-2014, 07:15 PM   #36
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Brad, Good Point! I seem to have those as well.
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Old 03-18-2014, 06:59 AM   #37
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I called Hamilton Engine Sales yesterday and there suggestion was to replace the high pressure fuel pump and the check valve in the top of the final fuel filter. But they wanted the engine serial number which I did not know. It's stamped into the bottom edge of the block on the exhaust side near the front. I can't see that area. After several hours of crawling under (in the rain) and looking with mirror and flashlight I finally got smart and stuck a small digital camera down from the top. Bingo! 6DB1-######. I'll call them back today and order the parts if they are available.

So word to the wise... know your engine serial number!
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Old 03-18-2014, 08:59 PM   #38
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Okay, lift pump and check valve on order. Tried to leave today but M/H would not make it up the first hill (in Florida!) then suddenly it ran fine. It's just not dependable enough to drive.
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Old 03-19-2014, 12:51 AM   #39
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I just bought a tank for a 1937 Chevy Pick Up street rod that I am building. I bought a universal tank, and they also build custom tanks to your specifications. The company is Tanks Inc. www.tanksinc.com
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Old 03-19-2014, 04:11 AM   #40
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I just bought a tank for a 1937 Chevy Pick Up street rod that I am building. I bought a universal tank, and they also build custom tanks to your specifications. The company is Tanks Inc. www.tanksinc.com
Thanks!!
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Old 03-19-2014, 04:23 PM   #41
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Help; Loss of power

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Okay, lift pump and check valve on order. Tried to leave today but M/H would not make it up the first hill (in Florida!) then suddenly it ran fine. It's just not dependable enough to drive.

Was the waste gate stuck open?

Didn't have time to read all the posts but a fuel pressure gauge is very handy to detect any issues with filters or the lift pump before they take out your high pressure pump. I doubt that any problems downstream of the high pressure pump would fix themselves. Possibly air in the system.

Sitting is the worst enemy these poor half a million mile engines have.
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Old 03-22-2014, 03:26 PM   #42
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I think I have an assignable cause! With the engine idling there were small bubbles appearing in the Racor fuel filter / separator. Bad sign. Disassembled filer and found small cracks in the plastic bowl at the bottom. So where can I get parts for a Racor 500FG filter / separator? Are parts still available? If not what would be an appropriate replacement? Surely someone else has replaced one by now. Monday I'll go looking for truck service shops and see if they can help with a replacement.
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