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Old 07-19-2018, 11:45 AM   #1
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Fuel problem

Having problems with. My 2000 mountain aire, if it sits for a week or 2 and I try to start it no start, I put some starting fluid in cranks right up and if I start it every day works fine, but if it sits for a week no start, this week on a road trip after about 200 miles it would not run more than 40mph, what could be the problem?
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Old 07-19-2018, 11:49 AM   #2
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I would start with a fuel filter change.
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Old 07-19-2018, 12:06 PM   #3
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Don't use Starting Fluid. It can damage a diesel engine (especially if you have air intake heater).

My guess is that you have a leak in the suction side of fuel system. That is letting the fuel drain back to tank when engine is shut off so the line is empty and that requires excessive cranking to get fuel before engine starts. This would/could also cause engine running performance problems.

I would start with a careful inspection of the fuel hose and fittings (in addition to changing the fuel filters as already mentioned).

You didn't say what engine your coach has.
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Old 07-19-2018, 12:18 PM   #4
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Old 07-19-2018, 12:19 PM   #5
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I changed fuel filter last week
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Old 07-19-2018, 01:08 PM   #6
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I assume you have the Cummins ISB6.7 engine (rated at 350 hp). See this article for most common problems https://hinessc.com/cummins-common-rail-fuel-system/
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Old 07-19-2018, 01:59 PM   #7
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Quote:
Originally Posted by max77713 View Post
Having problems with. My 2000 mountain aire, if it sits for a week or 2 and I try to start it no start, I put some starting fluid in cranks right up and if I start it every day works fine, but if it sits for a week no start, this week on a road trip after about 200 miles it would not run more than 40mph, what could be the problem?
My folk's 2003 Dutch Star has the 8.3 Cummins. We had some bad issues with fuel delivery also. Turns out there is a little brass screen on the intake side of the transfer fuel pump. And Spartan Chassis had no fuel filter between there and the tank. Who dropped the ball there?? To make a long, painful story short....we ended up installing a high micron fuel filter system with regular spin on filters. We had installed a fuel/water separator and fuel filter because there never was one, ever....like since brand new. Coming from the trucking world, I was amazed at this terrible omission!!

No problems ever since. And if there were, there are 2 extra filters for each position and a couple of gallons of fuel to fill 'em up.
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Old 07-19-2018, 05:28 PM   #8
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Mine recently shutoff on the last two tanks (after about 700miles) when it only held 75 to 80 gallons on fillup (tank capacity 100). I previously had run 85 gal to fillup for many tanks with no prob. . I might have to check the lift pump.
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Old 07-19-2018, 05:53 PM   #9
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I changed fuel filter last week
Tell is if you have one or two fuel filters?
Next I would check the air filter system
It may be part of your water separator if you have one.
Is it possible you got some bad fuel?
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Old 07-20-2018, 04:22 AM   #10
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Maybe it's a gas model?
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