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Old 06-19-2015, 01:25 PM   #1
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5.9 Cummins fuel issues

I have been having issues with fuel supply on my 1998 Fleetwood Discovery. It is equipped with a 5.9 275 hp cummins. It started last fall on our way to Bull Head City. When pulling some hills north of Vegas the engine started to serg. I changed out all the filters and marginal improvements. We limped home and i installed a new lift pump, better but still not right. When i used to use my hand operated lift pump it would pressure up, now it seems the fuel is going somewhere but see no leaks. Is this a injection pump problem or has anyone out there run into this problem?
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Old 06-19-2015, 02:11 PM   #2
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Is your engine a vp44 equipped 24 valve engine or p7100 equipped 12 valve engine?
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Old 06-19-2015, 02:17 PM   #3
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Quote:
Originally Posted by Salmon Run View Post
I have been having issues with fuel supply on my 1998 Fleetwood Discovery. It is equipped with a 5.9 275 hp cummins. It started last fall on our way to Bull Head City. When pulling some hills north of Vegas the engine started to serg. I changed out all the filters and marginal improvements. We limped home and i installed a new lift pump, better but still not right. When i used to use my hand operated lift pump it would pressure up, now it seems the fuel is going somewhere but see no leaks. Is this a injection pump problem or has anyone out there run into this problem?
Double check the fuel hose connections- when mine did that- it was sucking air in one of the connections
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Old 06-19-2015, 03:42 PM   #4
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Jake it's a vp44 with 24 valve.
off where did you find the problem with the hose connections?
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Old 06-19-2015, 05:36 PM   #5
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Jake it's a vp44 with 24 valve.
off where did you find the problem with the hose connections?
Bosch vp44 injection pumps are notorious for crapping out. Usually first signs are dead pedal and bucking badly under full load. But sometimes it's low supply pressure. I would check supply pressure it should be around 15-20 psi idling and 10 psi under full load with a stock lift pump.
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Old 06-19-2015, 05:44 PM   #6
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VP44 Diagnostic
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Old 06-19-2015, 07:22 PM   #7
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What hoses did you check?
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Old 06-19-2015, 09:56 PM   #8
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The older 5.9L engines were notorious for the supply and return "rubber" fuel lines (from steel lines to engine) inner liner breaking down and reducing or stopping flow. They appeared OK on the outside but inside the liner would swell and bunch-up after coming loose from the outer sheath. Since the 5.9 does not have a fuel pump supplying the injector pump (in pickup application), this rather quickly ruined the injector pump.
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Old 06-30-2015, 03:58 PM   #9
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tons of misinformation on the internet, no one will commit to the proper psi after lift pump, I have seen everything from as low as 9 to as high as 20. I'm at 14-12psi range from idle to heavy throttle.
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Old 06-30-2015, 04:49 PM   #10
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Quote:
Originally Posted by Salmon Run View Post
I have been having issues with fuel supply on my 1998 Fleetwood Discovery. It is equipped with a 5.9 275 hp cummins. It started last fall on our way to Bull Head City. When pulling some hills north of Vegas the engine started to serg. I changed out all the filters and marginal improvements. We limped home and i installed a new lift pump, better but still not right. When i used to use my hand operated lift pump it would pressure up, now it seems the fuel is going somewhere but see no leaks. Is this a injection pump problem or has anyone out there run into this problem?
Try to get someone to drop the codes for you to make sure it is a fuel problem. When the crankshaft sensor goes bad it can cause havoc. It is an easy changeout. I monitor my Liftpump pressure and my diagnostic codes in real time while traveling. The new stock liftpump can deliver up to 15 psi. If it gets close to 5 replace it. As I understand low liftpump pressure it a main cause of VP44 failure.
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Old 06-30-2015, 11:34 PM   #11
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If my memory serves me, the lift pump has a return to the fuel tank(those 2 rubber lines). This is utilized when the injector pump cannot use it as fast as the lift pump supplies. I wonder if the lift pump fails internally, the manual fuel pump you used(fuel going somewhere) was pumping fuel into the return line?
A lift pump rebuild kit was available for my 1996 Dodge CTD (5.9)
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Old 06-30-2015, 11:43 PM   #12
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tons of misinformation on the internet, no one will commit to the proper psi after lift pump, I have seen everything from as low as 9 to as high as 20. I'm at 14-12psi range from idle to heavy throttle.
Test info from Cummins on the Dodge/Cummins electric lift pump on the 24 valve engine , was always GPM , not PSI.
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Old 07-01-2015, 07:58 AM   #13
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I'm having the head gasket replaced on my 99 24v 5.9 in less than two weeks.

Is there anything that would be recommended to replace while they have it apart relating to the fuel system, based on what I'm reading in this thread?

I am all about prevention, within reasonable limits...

Hope you get your problem solved, OP.
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Old 07-01-2015, 08:12 AM   #14
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I'm having the head gasket replaced on my 99 24v 5.9 in less than two weeks.

Is there anything that would be recommended to replace while they have it apart relating to the fuel system, based on what I'm reading in this thread?

I am all about prevention, within reasonable limits...

Hope you get your problem solved, OP.
My first lift pump failed causing the injector pump to also fail. $3,500 later it was good. !00,00 later I had my second lift pump replaced as a preventive maintenance measure. Cheap insurance.
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