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06-19-2015, 12:25 PM
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#1
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Member
Join Date: Jul 2013
Posts: 84
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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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06-19-2015, 01:11 PM
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#2
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Senior Member
Join Date: Jan 2015
Location: Hanceville,AL
Posts: 152
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Is your engine a vp44 equipped 24 valve engine or p7100 equipped 12 valve engine?
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06-19-2015, 01:17 PM
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#3
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Member
Join Date: Sep 2012
Location: Corpus Christi
Posts: 48
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Quote:
Originally Posted by Salmon Run
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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Double check the fuel hose connections- when mine did that- it was sucking air in one of the connections
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06-19-2015, 02:42 PM
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#4
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Member
Join Date: Jul 2013
Posts: 84
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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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06-19-2015, 04:36 PM
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#5
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Senior Member
Join Date: Jan 2015
Location: Hanceville,AL
Posts: 152
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Quote:
Originally Posted by Salmon Run
Jake it's a vp44 with 24 valve.
off where did you find the problem with the hose connections?
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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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06-19-2015, 04:44 PM
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#6
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Senior Member
Join Date: May 2012
Location: Spring Valley AZ
Posts: 1,226
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__________________
Don, Mary and Spooky
'00 Bluebird Skoolie Conversion
Geo Tracker/Dodge Neon/Aprilia Scooter towed
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06-19-2015, 06:22 PM
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#7
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Member
Join Date: Jul 2013
Posts: 84
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What hoses did you check?
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06-19-2015, 08:56 PM
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#8
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,897
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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.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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06-30-2015, 02:58 PM
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#9
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Junior Member
Join Date: Jun 2015
Location: New York
Posts: 7
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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.
__________________
99 Bounder 39z 275
03 Excursion 7.3
07 Mercedes R CDI
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06-30-2015, 03:49 PM
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#10
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Senior Member
Monaco Owners Club Freightliner Owners Club Holiday Rambler Owners Club
Join Date: Jul 2009
Location: Spring Hill, Florida
Posts: 1,380
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Quote:
Originally Posted by Salmon Run
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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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.
__________________
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
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06-30-2015, 10:34 PM
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#11
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,897
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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)
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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06-30-2015, 10:43 PM
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#12
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,442
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Quote:
Originally Posted by Sgt.
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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Test info from Cummins on the Dodge/Cummins electric lift pump on the 24 valve engine , was always GPM , not PSI.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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07-01-2015, 06:58 AM
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#13
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Senior Member
Join Date: Oct 2013
Posts: 682
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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.
__________________
MotorHomeless At This Time...
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07-01-2015, 07:12 AM
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#14
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Senior Member
Winnebago Owners Club
Join Date: Feb 2008
Posts: 728
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Quote:
Originally Posted by Bad Bolt
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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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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