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Old 01-16-2025, 10:27 AM   #1
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Fuel tank issues?

Has anyone ever had an issue with the fuel tank pick up tubes being penetrated and the fuel pump sucking air? We have put a bore scope into the tank and cant get past the bulkhead to see much of the pick up tube, but it almost looks like the tub could be rubbing on the bulkhead and have a hole in it causing us to suck air. Dropping the fuel tank is going to be a big job so I am hoping to avoid it. I am going to get some clear hose now to put between the lift and injection pump to check for air that way, but figured it was worth asking.
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Old 01-16-2025, 03:52 PM   #2
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I never read about anyone having that inside the tank. The things I've read about are leaks from the rubber tubes on TOP of the tank, not inside as from the several I've seen I believe they are always metal. There are many model RVs where the fuel hoses connected to the submersible part had scuffed the top or edge of the tank and got cut a bit. Including genset hoses.

Have you looked for a wet spot around your tank perimeter? Note you do have to drop the tank to repair a leak like that but only 6" as I recall. You could do a iRV2 search for helpful threads.
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Old 01-16-2025, 04:30 PM   #3
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The fuel hoses on my 2001 go to the rear inside the passenger side frame rail.

You can access the fuel tank opening by extending your generator slide and crawling under the coach.

The photo provided is one I took after I installed a FASS fuel pump.

Many vehicle owners who have the ISC/ISL engine have had trouble with the fuel pump leaking and letting air in the system. The stock pump runs for 30 sec after you turn the ignition key. After 30 seconds, the CAPS pump starts sucking the fuel.

This is a great read from IRV2: https://www.irv2.com/forums/f104/fas...e-484540.html*

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Old 01-16-2025, 11:42 PM   #4
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Got a little ahead of myself, but did want to see if anyone ever had issues inside the tank. We put new fuel lines on front to back, and all hydraulic hoses. We are now putting a new CAPS pump on and I am confident it will be finally fixed. I have now had as much in repairs and maintenance as I paid the original owner for the coach. Its been very frustrating. Hopefully the frustration is over.
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Old 01-19-2025, 10:50 AM   #5
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It's Alive

I work for carlsagan turns out the CAPS pump left the chat I installed a new pump Friday afternoon and it starts and runs like new now, it didn't even sound like it was missing at all like it did when cold right before the pump died.
Now just waiting to get the cooling package back from the radiator shop Monday and reinstall it. Before you ask when I started it on Friday I only let it run for a few seconds before shutting it down. I've been working on busses and heavy equipment for years.
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Old 01-19-2025, 11:09 AM   #6
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The older ISC engines uses an electric lift pump that runs for ~45 seconds to prime the CAPS pump. This was a known problem, it would start leaking while it was running but then it would allow air to be sucked into the CAPS pump. Ultimately causing failure.

Cummins had a TSB on this, this was just for Monaco built coaches but I'm sure it was across all makes of coaches that use the Cummins with CAPS injection pump.



My lift pump started to leak in 2020. I was aware of the potential so kept an eye open. I did a service on the rig and drove it, then parked and crawled underneath and heard a sizzling sound. Found the fuel dripping onto the exhaust, never reached the ground. Fuel was from the lift pump.
Long story short, short term I tightened the 3 bolts on top of the lift pump to stop the leak. Long term I installed a FASS pump.
Attached Files
File Type: pdf Cummins ISL Lift Pumps service bulletin.pdf (214.6 KB, 3 views)
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Old 01-19-2025, 03:18 PM   #7
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Thanks for that info the shop that tried to repair it for us when it broke down on the road put a brand new lift pump in it
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Old 01-22-2025, 12:54 AM   #8
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Thanks for the info, I probably would have done a FAAS pump, but now I have a brand new lift pump thanks to the parts changers that worked on it before I went to get it and we changed the CAPS pump here. The guy that posted before this did the work. He is pretty smart.
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