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Old 09-07-2016, 09:39 AM   #1
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Onan 15 MDJF-3CR fuel pump help

Hi all, My fuel pump is leaking on my Onan 15.0 MDJF-3CR/2268AA generator. rebuild kit part number seems to be 149-1703. But Cummins says that it is obsolete and cannot get it. I have seen some other posts about replacing with an electric fuel pump, but cannot believe that nobody makes these parts any longer. Any thoughts or comments are appreciated, if the electric pump is the way to go, can anyone give me some recommendations on pump model numbers etc... that they have used.

Thanks for all your help
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Old 09-07-2016, 10:02 AM   #2
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I put in a Walbro pump for $140 and it works great. Cummin's can be a pita sometimes.
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Old 09-07-2016, 11:28 AM   #3
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A Facet 5psi is often available at auto parts stores. Cut an aluminum plate to cover hole where lift pump went.

Also, if it is the kind with screws holding the pump together, try snugging the screws. cured many a leak on those that way.
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Old 09-07-2016, 01:31 PM   #4
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Thanks for the input. If I do end up replacing with electric pump can someone put me in the ballpark of where the best sot would be to tie into the 12 v power so that the pump turns on and off at the proper times?

Thanks all
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Old 09-07-2016, 02:19 PM   #5
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Connect to fuel solenoid lead. It will run any time the engine is running. If you want to prime, disconnect pump and jump to starter lead. Also make sure you get right voltage, those old gens could be 12,24 or 32v on the control system.
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Old 09-07-2016, 03:46 PM   #6
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You need a pump that meets or exceeds the stock pump. Diesel fuel pumps supply excessive fuel to cool the injector pump before being returned to the tank. Also the fuel passes thru the filters several times so debris or organisms are caught soon after being introduced.
The electric pump will help bleeding, too. Pumps like the one pictured are available on ebay for about $16 and pump up to 35 gallons/hour. Cheap enough to buy 2. I have them on my Detroit mains as backup and for filling new primary filters. They are powerful enough to supply fuel if the engine driven pump fails.
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