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Old 10-24-2021, 08:56 PM   #1
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Fuel Strainer on Roadmastter RR4R Chassis?

Does anyone know if the Roadmaster RR4R chassis has a "hidden" fuel strainer between the fuel tank and the first fuel filter? My coach has lost power, and I changed the fuel filters with no joy. I have read several threads about a hidden fuel strainer in some Freightliner chassis but I didn't see anyhing about the Roadmaster. I am broken down in New Mexico and need a fix. Thanks for any info.
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Old 10-25-2021, 08:57 AM   #2
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Chassis type shouldn't have anything to do with the fuel system, that is a function of the engine. Assuming you have a Cummins engine, or any diesel engine for that matter, there should be a fuel/water separator in the fuel line system. Sounds like you could have water in your fuel, and the separator needs to have water drained out. If that is the problem finding the separator isn't difficult. It is a fuel filter looking canister with a drain cock of some sort on the bottom. Open the drain cock and see if water comes out of the canister. If it does, continue to drain the canister until no more water comes out and then try to start the engine.
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Old 10-25-2021, 09:19 AM   #3
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Quote:
Originally Posted by JeepTJ5 View Post
Does anyone know if the Roadmaster RR4R chassis has a "hidden" fuel strainer between the fuel tank and the first fuel filter? My coach has lost power, and I changed the fuel filters with no joy. I have read several threads about a hidden fuel strainer in some Freightliner chassis but I didn't see anyhing about the Roadmaster. I am broken down in New Mexico and need a fix. Thanks for any info.
Frighliner did put an in-line fuel strainer (hidden) in the frame that cost one Owner a lot of money to figure out. Roadmaster did not do this.

What symptoms are you experiencing?
Does the engine run, but is just low on power?
Is the "check engine" light on?
Any tailpipe smoke while accelerating or revving up?
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Old 10-25-2021, 09:20 AM   #4
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Which engine do you have??
Any warning lights on dash? Do you have the ability to check for any codes? Not sure if it will work on your coach but I've read that you can turn the key on without starting and then depress the fuel pedal fully 3 times and it will flash on the dash.



I have never read of Monaco installing a fuel strainer. There is normally a primary and secondary fuel filter.



One thing to check is to see if the fuel transfer pump (on most earlier rigs) to see if it is leaking. This will depend on engine.
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Old 10-25-2021, 11:50 AM   #5
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Pretty much only on Frightliner but read also on some Spartan.
More reports of leaking lift pump gaskets it will leak more air in than fuel out, blown or loose turbo/CAC hoses , stuck Pac brake and collapsed air filter is possible.
You should add some symptoms have you had any codes pulled, stop engine lights. Did it happen going down the road .
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Old 10-26-2021, 09:22 AM   #6
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It has been confirmed that Roadmaster did not put in a fuel strainer. I have had the problem diagnosed and it appears the lift pump is not working. A new one will be installed today and I HOPE I can be back on the road. A short test-drive will tell all.

My symptoms were engine would hesitate badly when trying to accelerate (could not get over 35mph) and Check Engine light would come on. (And then go off if not causing hesitation) VMSPC showed PID 94. (Fuel System Pressure Low) The Cummins software showed the same PID but gave a much better explanation of the fault. However, a technician had to do a pressure check to determine where the failure was.

Thanks to all who replied. Really appreciate the help.
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Old 10-26-2021, 12:57 PM   #7
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What engine do you have.


I have a 8.3 ISC. My lift pump would only run ~30 seconds to prime the filters and injection pump. After that the injection pump pulls the fuel from the tank.

If the lift pump was leaking when priming then it was sucking air when the injection pump took over. This is the cause of many injection pump failures.
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Old 10-29-2021, 10:25 AM   #8
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I have an ISB (300) and the pump they called a transfer pump was not functioning. They replaced it and the engine now runs as before. The pump was not leaking, it just didn't work anymore.(The pump was an OEM Cummins part) Thanks for your interest and reply.
Don.
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