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05-22-2020, 12:30 PM
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#1
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Junior Member
Join Date: May 2020
Posts: 9
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97 Monaco Dynasty Fuel Issue
Hi Group,
New to the RV world and I recently picked up a 97 Monaco 32' RV. Has a Cummins (not sure on the model though) with 19k miles. Its having a fuel issue and I am thinking its the fuel transfer pump/lift pump but wanted some opinions. If I pour fuel in the water separator or clear filter just before the main fuel filter it starts right up and runs til the fuel runs out. After doing this a while and using the primer bulb I was able to get fuel to continue to flow for a little while and was able to drive it to the gas station and fill it up. However, when I went to start it back up the issue re-surfaced. I spoke to my local Cummins service rep and he is thinking a transfer pump as well. Anyone have any experience in replacing these or is it better to let the service dept do it? Also, anyone have any info on the engine?
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05-22-2020, 01:37 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 11,227
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Really need to know the engine model to confirm.
But, I have a ISC 8.3 Cummins. It may be similar to yours.
The fuel transfer pump is mounted on the passenger side of the engine above the starter towards the rear of the engine(which is toward the transmission).
You should be able to hear the fuel pump start when you turn your key on, it will run for about 30 seconds to push fuel to the injector pump.
The transfer pump has 3 bolts that hold it together, these bolts have been known to loosen up, which lets the pump suck air and leak fuel. First thing I'd do is try tightening up these bolts.
Next check the fuel filter. Note that some fuel filters come with a small gasket that fits up over the threaded portion, make sure someone hasn't left an extra one on.
Change both fuel filters, perfill the filters with clean fuel, best to plug the center hole and pour fuel in the outside holes.
Try turning off and on the ignition 3-4 times to get air out of the system, then try to start.
You can join the Cummins Quickserve site, setting up the account is free. Once you have an account you can put in the SN of your engine and then can look at what resources are available, you can look up maintenance information, parts etc.
My fuel transfer pump number is 4935005, you can do a search and see what it looks like. Cost is ~$300
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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05-22-2020, 05:46 PM
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#3
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Senior Member
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 5,343
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The gaskets for the transfer pump have discontinued OEM but have been reproduced by a couple small parts guys for around 10 bucks.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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05-22-2020, 06:01 PM
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#4
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 25,837
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Welcome to iRV2.
Sorry your first post is about problems .
Unfortunately your coaches year and the changes the Cummins went through in the 97/98 production years lead to many information issues.
You have to know if your engine has a fully mechanical injection pump; 12 valve engine; or is one of the very first ISC 8.3 L engines with the CAPS ( Cummins Accumulator Pump System ).
If you've been working on the engine can you identify the type of fuel injection pump from these two pictures .
First is the mechanical P 7100
Second is the semi electronic CAPS used on the first ISC.
Different issues for both fuel systems can give the problem you describe.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-23-2020, 05:15 AM
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#5
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Senior Member
Monaco Owners Club Vintage RV Owners Club Holiday Rambler Owners Club
Join Date: Jul 2012
Location: Lexington, SC
Posts: 2,467
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Get your ESN (engine serial number) and go to
https://quickserve.cummins.com/info/index.html
Register your vehicle. It's a great source for info on replacement parts. You can also call Cummins Customer Service ( 1-800-343-7357 ) and give them your ESN
This will tell you where to find your ESN :
https://www.dieselpartsdirect.com/fi...-serial-number
__________________
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
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05-23-2020, 03:20 PM
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#6
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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On a 97, I doubt you have a lift pump which you can hear run on the engine for about 30 seconds when you turn the key on.
The grey electric solenoid in the first picture ^^^^ is a common problem... does not pull the fuel shutoff all the way open. You can manually help it.
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05-24-2020, 03:36 PM
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#7
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Senior Member
Join Date: Sep 2016
Location: Sarasota, FL
Posts: 5,082
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Hmmm, I can hear something purring for about 30 seconds. When I turn the key the engine starts right up, no delay.
__________________
Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
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05-25-2020, 08:32 AM
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#8
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 25,837
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Quote:
Originally Posted by RKins
Hmmm, I can hear something purring for about 30 seconds. When I turn the key the engine starts right up, no delay.
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If your in the drivers seat and hear purring , at key on, there's a good chance that what you can hear is the dash HVAC unit's vacuum pump.
OR; I suppose there is a chance that a PO , added and electric lift pump near the fuel tank to help get the fuel back to the engine's mechanical lift pump.
Look on the outside of the fire wall for the electric vacuum pump pictured below , disconnect it and see if you still hear the purring at key on.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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05-25-2020, 10:25 AM
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#9
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Moderator Emeritus
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 24,916
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Wolfman73's '97 Dynasty almost surely has a mechanical lift pump rather than electric, but that's the first thing to verify (see others replies on how to do that). The info I have says the Cummins 5.9L "B" and 8.3L "C" engines use the same lift pump. A Dynasty might have the "L" engine, though, and that is a different fuel system.
I'd be looking at the possibility of a collapsed fuel line from lift pump to tank or a clogged intake on the lift pump (it has an intake screen). There is also the possibility of a leaky pump gasket or simply loose mounting bolts. Work all of those possibilities before deciding the pump itself is bad.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
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05-28-2020, 01:37 PM
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#10
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Senior Member
Join Date: Dec 2011
Location: Whitney, TX.
Posts: 207
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My 1997 Dynasty is a Cummins C8.3 mechanical engine. Has a mechanical fuel transfer pump bolted on the passenger side of the engine block, just below the Secondary Fuel Filter. Fairly easy to change out. Also may wish to insure Fuel Cut Off Solenoid is staying open.
__________________
Charles
1997 Monaco Dynasty
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06-01-2020, 01:56 PM
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#11
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Junior Member
Join Date: Oct 2019
Posts: 14
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on my 97 signature, the fuel shut off valve failed last fall, would run for a few seconds the motor would quit.
__________________
97 Monaco Signature M11
2005 Civic Toad, 2014 CRV Toad
Overbuilt Golf cart rack
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12-03-2020, 05:02 PM
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#12
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Junior Member
Join Date: May 2020
Posts: 9
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Quote:
Originally Posted by cry42
My 1997 Dynasty is a Cummins C8.3 mechanical engine. Has a mechanical fuel transfer pump bolted on the passenger side of the engine block, just below the Secondary Fuel Filter. Fairly easy to change out. Also may wish to insure Fuel Cut Off Solenoid is staying open.
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Thanks!! Sorry it has taken so long to respond. I just got the mechanical fuel transfer pump replace due to it not having any pressure. We have found 2 problems after replacing the pump.
1. It starts right up and then will shut off after running a few seconds/min. Still has pressure though.
2. The gas pedal does not work now. It worked fine a few months back but now it does not. Control board of some kind?
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12-03-2020, 05:21 PM
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#13
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Senior Member
Join Date: Dec 2011
Location: Whitney, TX.
Posts: 207
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Pretty certain you 97 is a mechanical Cummins, mine is.
1. Mechanical fuel pump on passenger side, below the fuel filter, easy to replace and fairly low cost.
2. If you have the old Winn primary filter could be sucking air.
3. Fuel Cut Off Valve not holding open after start up, found on Fuel Injection Pump. Fairly inexpensive and easy to replace.
4. Throttle not working, if it is a King Control throttle or throttle and cruise, long out of business and company that repaired them now out of business. Everyone with the King Cruise/Throttle Control facing a major issue (including me).
King Control Throttle/Cruise is a box on passenger side, engine room, attached to frame and has a cable going to the Fuel Injection Pump throttle lever.
Feel free to PM me anytime.
Good luck with figuring it all out.
__________________
Charles
1997 Monaco Dynasty
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12-08-2020, 09:31 AM
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#14
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Junior Member
Join Date: May 2020
Posts: 9
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Throttle Control Board Location
Quote:
Originally Posted by cry42
Pretty certain you 97 is a mechanical Cummins, mine is.
1. Mechanical fuel pump on passenger side, below the fuel filter, easy to replace and fairly low cost.
2. If you have the old Winn primary filter could be sucking air.
3. Fuel Cut Off Valve not holding open after start up, found on Fuel Injection Pump. Fairly inexpensive and easy to replace.
4. Throttle not working, if it is a King Control throttle or throttle and cruise, long out of business and company that repaired them now out of business. Everyone with the King Cruise/Throttle Control facing a major issue (including me).
King Control Throttle/Cruise is a box on passenger side, engine room, attached to frame and has a cable going to the Fuel Injection Pump throttle lever.
Feel free to PM me anytime.
Good luck with figuring it all out.
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Thanks for the great info. Where is the control box/board located?
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