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Air intrusion | Replace the olives or replace steel lines
I've honestly never pulled the bed off any truck I've had to do any kind of work. It doesn't seem difficult, it's more finding where to keep it. I think I'm going to attempt to drop the tanks. With the tanks being ~half full and the truck being lifted, it may just be easier to pull the bed...- John_piv
- Post #36
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
UPDATE | After a little more testing, I believe I have narrowed down the problem. I put the quick disconnect directly off the tank into a five gallon can of diesel, and suddenly; no more bubbles! I looked down inside the QD and the seals seemed to be intact, so I'm suspecting the sending unit...- John_piv
- Post #30
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
Right now I'm just using 3/8 clear hose from tractor supply. Diesel will eventually eat through it if you ran it permanently, but it's nice for finding problems like this. Permanently you'd likely be better off with the factory plastic-ish lines or steel hardlines. On that note, does anyone...- John_piv
- Post #23
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
Update | I attached to clear tube from the quick disconnect fitting on selector valve outlet to the plastic factory fuel line. It has little bubbles in it, which hopefully narrows my search down to selector valve back.- John_piv
- Post #18
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
Sending unit rust would be a good thing to check. On occasion my gas gauges will just ping all the way to full before coming back down, my thought was because of a bad ground. That could be rust, might be worth checking- John_piv
- Post #17
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
No, that helps. I was expecting it to be where it seal under the clip, not up inside the clip. Your dead right about finding a fuel leak. When it started surging on both tanks, I was hoping for a visual leak; but no luck. I'll probably start out by replacing all 6 disconnects just to be safe, I...- John_piv
- Post #14
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
Just tried the jug of diesel straight to the pump, and lo and behold that fix the bubbling. Problem is that means it's somewhere in between the tanks and the pump... Went ahead down to the selector valve, but I'm not seeing any rings whatsoever inside of the quick disconnect. Have you got a...- John_piv
- Post #12
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
What are some of the main problem areas on the feed side? Lot of guys say fuel heater, but my 6.9 doesn't have one. Lines going to the filter/lift pump? Lines to injector pump? Or literally every hose or pipe from the tanks?- John_piv
- Post #5
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
Right now I have the stock mechanical pump. Your saying to test it you just bypass the whole tank system and just throw a hose in a 5 gal diesel can?- John_piv
- Post #3
- Forum: 6.9L IH & 7.3L IDI Diesels
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Air intrusion | Replace the olives or replace steel lines
Hey y'all, she's sucking' air... I've got a clear line on my return line coming from the injection pump and I see little bubbles as the trucks running. She idles fine, runs a little rough, but refuses to idle after running; that makes me think it's somewhere in the return lines. I'm steadily...- John_piv
- Thread
- Replies: 39
- Forum: 6.9L IH & 7.3L IDI Diesels
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Leaking injector return
Which O-rings? The rubber return line rings on the injectors were replaced earlier this year. Y'all mean the little ring connecting the metal return lines? If so, where do I find one?- John_piv
- Post #4
- Forum: 6.9L IH & 7.3L IDI Diesels
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Leaking injector return
Hey y'all, my way into work this morning I was running WMO when the truck starred surging a bit. Switched it over to plain diesel and smelled diesel the whole way in to work. I pull in, pop the hood, and sure enough; the rear driver injector is soaking wet. (Wet injector and dry injector...- John_piv
- Thread
- leaks wmo
- Replies: 14
- Forum: 6.9L IH & 7.3L IDI Diesels
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Engine randomly accelerates, but only on rear tank
I'm actually in central FL. I was banking on the warmer temps helping with viscosity. I keep the front tank full of just diesel, but it probably wouldn't hurt to keep some spare filters on hand. First priority is going to be to check my selector connections, but I appreciate the feedback!- John_piv
- Post #7
- Forum: 6.9L IH & 7.3L IDI Diesels
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Engine randomly accelerates, but only on rear tank
I did just recently pull the fuel tank selector valve to check it. Maybe I don't have the rear tank on all the way. On the other hand, the oil is use is from a farm, so the weight varies from 0-20w to 80-90w; so viscosity could also be to blame.- John_piv
- Post #5
- Forum: 6.9L IH & 7.3L IDI Diesels
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Engine randomly accelerates, but only on rear tank
Recently started running WMO in my 6.9 IDI. Truck ran like a top here for a while, but recently it started surging. I only put oil in the rear tank at about a 50/50 mix. While driving, the engine will randomly accelerate about 500 RPM before dropping back down, even on cruise. Switching to the...- John_piv
- Thread
- idi wmo
- Replies: 13
- Forum: 6.9L IH & 7.3L IDI Diesels
