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Old 05-31-2016, 12:18 PM   #1
Join Date: May 2015
Posts: 45
99 Monaco Windsor Fuel Leak

Have a 99 Monaco Windsor 8.3 - 330HP, developed a small Fuel leak above the Starter, only when shut off, I'm thinking maybe that is where the lift pump is, if so to get at it , it looks like maybe it would be easier to remove the starter. It drips on the starter and down onto the exhaust when sitting, I can't see it dripping when it is running but that area is wet. Can someone confirm that is where the lift pump is located and easiest way to get at it.
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Old 05-31-2016, 09:42 PM   #2
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Off hand I do think the lift pump is above the starter. I would also check the fuel lines and connections on the lift pump.
From what I have heard leaking is a sign of the lift pump failing.
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Old 05-31-2016, 10:46 PM   #3
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Sounds like the lift pump, this is where my pump started leaking. There are a lot of posts here on irv2 regarding lift pump replacement. Some members only replace the gasket others replace the entire pump. When these lift pumps start failing they can damage the injector pump from lack of fuel. I bypassed my lift pump and installed an aftermarket Fass pump that runs all the time. Access to the pump is from both top and bottom. Mine is a very tight fit.
2003 Country Coach Intrigue 36'
Cummins ISL 400
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Old 06-01-2016, 08:00 AM   #4
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Is your engine an 8.3 ISC, if so yes, the lift pump is located above the starter.

The lift pump is known to be a problem, in fact Cummins had a service bulletin ( I have a copy of it dated Nov 2006) instructing shops to change the gasket on rigs that come into the shops for other work, they did not have a full blown recall. They then instructed the shops to just change the pumps, initially at no cost to owners. I guess this was getting too expensive so they now let the owners discover the problem and pay for the repair.

I would suggest you join the Cummins Quick Serve site, once registered with Login & Password you can put in the SN of your engine. I will then bring up a new page with tabs at the top including parts and service. Under the parts tab you can see different catagories of the engine including fuel delivery. Look under here for the lift pump, it will provide part numbers etc.

Cummins will not sell the gasket anymore but I did find a source for one, Capital Volvo in Montgomery AL. I ordered a gasket just to have one on hand to get me going, I would then replace the pump itself. The gasket part number I ordered is 4928511, cost was $6.71 + shipping. Initially they wanted to ship FedEx for $$$ but instead the person I talked to said they'd just put in an envelope >> cost was $1 so total cost was $7.71.

I inspect my fuel lift pump everytime I'm under the coach. You should be able to access the pump from your closet engine hatch, not easy to get to or see. A new lift pump is ~$350-400, if you have a shop do it add that much more for labor. My fuel pump PN is 4935005, I have all the info from the Quickserve site saved for future reference.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 06-01-2016, 10:31 AM   #5
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Thanks for the replies,Anyone know the easiest way to get at the Lift Pump?
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fuel, leak, monaco

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