breister Posted December 23, 2015 Report Share Posted December 23, 2015 I have a 2002 Monaco Windsor with a 350hp cummins 8.3l engine. When I first start it up there is a slow drip of fuel for a couple minutes under the engine area. After a small puddle about the size of a softball is created it stops. When I climb under the unit, I can see it is coming from a pump or something next to the oil pan on the curb side. The part is made by Delco Remy and has a serial # on it but I don't know what this is? Is it a fuel pump maybe? The leak seems to come from a gasket between this part and what it is connected too. Any ideas what this is and why it quits after a couple minutes? Thanks much Brian Link to comment Share on other sites More sharing options...
RBH Posted December 23, 2015 Report Share Posted December 23, 2015 Don't know what it is but the leak probably stops because as the engine heats up things expand and close up. Get it fixed since it will only get worse and is a fire hazard. Link to comment Share on other sites More sharing options...
AFchap Posted December 24, 2015 Report Share Posted December 24, 2015 The lift pump is the likely culprit. As I understand it, it's primary job is to get fuel flowing to get the engine running, then it lets the fuel pump take over. As mentioned above, some have found tightening the bolts stops the leak. But the use of ULSD fuel in a system that formerly ran the older diesel mix will shrink the seals and cause a leak eventually. Many of us have had to replace the lift pump for that reason. Paul (KE5LXU), former fulltimer, now sometimer... '03 Winnebago Ultimate Advantage 40E '05 Honda Odyssey Escapees, FMCA, WIT, SMART http://www.pjrider.com Link to comment Share on other sites More sharing options...
Randyretired Posted December 24, 2015 Report Share Posted December 24, 2015 The lift pump on our Cummins ISX was leaking like yours then quickly it was worse. When I took it off there were some bolts inside the pump that were loose. Tightened these and not a leak since. That was 2 years ago. Randy 2001 Volvo VNL 42 Cummins ISX Autoshift Link to comment Share on other sites More sharing options...
breister Posted December 24, 2015 Author Report Share Posted December 24, 2015 Thanks for the input everyone. I will try tightening the bolts and if that doesn't work will replace the gaskets. Thanks again!!!! Link to comment Share on other sites More sharing options...
breister Posted December 26, 2015 Author Report Share Posted December 26, 2015 Actually I was able to get a part number off the item that leaks and it's the starter. Why would this have fuel in it? Why would it stop leaking after a couple minutes or so? Any input would be appreciated! Brian Link to comment Share on other sites More sharing options...
Smitty77_7 Posted December 26, 2015 Report Share Posted December 26, 2015 Look above the starter, good chance the source is as mentioned - the Lift Pump:)! The trickle down effect, could make it look like the starter. That being said, are you sure it is diesel fuel that is leaking? Could it b coolant? We had two compression nuts loosen over the years, and it was enough for a few drops of coolant to leak. PITA to reach on our ISL, but just resounding them back up, was enough to stop the leak. And, I'll tell you my first thought due to location of the leak, was that it was sourced from the Lift Pump. If it is the Leak Pump, you might want to consider replacing it with an aftermarket fuel pump. We did preemptive maintenance on ours, and bypassed the Lift Pump, and installed the FASS Fuel Pump (Just the pump, not the duel filters too. As our Country Coach came with good filtration systems in place.). These CAPS era ISC's and ISL's depend upon fuel flowing to the Injector Pump to do both lubrication and cooling. While Lift pumps are not cheap, they are when compared to ruined Injector Pump:)! I personally run an additive lubrication to each tank, as these engines were designed for pre USLD Type 2 fuels. Many will say it's not needed, but I consider it cheap insurance. On the items designed for pre USLD, any rubber fuel lines, say to the generator, or if you have it the Hydro/Aqua Hot, do not play well with the ULSD's. They eat away the fuel line, and leakage is very possible. Fires have resulted from leaking diesel running onto a hot exhaust of a generator. Good item to check into on any coach designed in that era, and add to your preventative maintenance. We've replaced both our generator and Hydro Hot fuel lines. Best of luck to you, and please close the loop back and let us know what you find out! Smitty Be safe, have fun, Smitty 04 CC Allure "RooII" - Our "E" ride for life! Link to comment Share on other sites More sharing options...
Kirk W Posted January 1, 2016 Report Share Posted January 1, 2016 Your starter has absolutely no diesel fuel in it. Like what was said, the lift pump is above the starter so you are seeing gravity at work. Well, it shouldn't have. And it will cause problems there if not corrected. Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
breister Posted January 4, 2016 Author Report Share Posted January 4, 2016 So assuming it is the life pump that's leaking and it's located above the starter, how in the world do I get up there to repair/replace it? Do I need to remove the starter to get up there? It looks like that may be the case. Doesn't seem like a fun or easy job? Thanks again for any input/suggestions. Brian Link to comment Share on other sites More sharing options...
AFchap Posted January 5, 2016 Report Share Posted January 5, 2016 Getting to it above the starter is a combination of stretching up from below and hanging upside down from above via the access panels under the bed &/or closet ... mostly from above. Paul (KE5LXU), former fulltimer, now sometimer... '03 Winnebago Ultimate Advantage 40E '05 Honda Odyssey Escapees, FMCA, WIT, SMART http://www.pjrider.com Link to comment Share on other sites More sharing options...
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