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Fuel starved genset
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Supporting Member of Barthmobile.com 6/17
Picture of Richard_Muise
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My Koehler commander 7.5 kW genset starts great but begins to shake and run rough after a few minutes. I have a porcelain fuel filter in front of the regulators and it's clean. Any suggestions? Thanks.


R.P.Muise 1994 Breakaway/Cummins 5.9/Allison transmission/Spartan Chassis
 
Posts: 638 | Location: Hampden, Massachusetts | Member Since: 10-13-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 3/19
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I don't have a KOHLER. But, my diesel powered 10KW genset would not stay running when I had porous, deteriorated fuel lines. The fuel pump for it is really tiny -- not powerful enough to supply the engine if air is getting mixed with the fuel.
 
Posts: 2013 | Location: Jackson, Michigan, USA | Member Since: 04-18-2004Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 12/10
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Richard, I have a 6.5 on the boat, a 4 cylinder engine, the same was used on the 7.5 with a different carb if memory serves. Two questions come to mind, easiest first, do you have a decent load on the genny? I am thinking above 50%. Second is not so easy, the fuel pump can be iffy, a perforated diaphragm or diaphragm that is soft, that would allow it to run but not deliver sufficient fuel to keep the carb bowl filled. FWIW,
Tim


Money can't buy poverty
 
Posts: 869 | Location: St. Charles, MO, USA | Member Since: 10-09-2003Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 3/11
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Is your Koehler a Diesel? If so the small fuel line pump is just a “lift” pump that supplies the high pressure pump on the engine. Ours is a 4 cyl Kubota. This pump can be purchased at most Auto Zones for about $40, sometimes less. The model is not important only that is produces about 6gpm and runs off 12v. Because of the age of the lines it is best to drop the tank and replace all rubber connections. Ours has rubber from the tank to the metal line attached to the frame rail and then rubber from the metal line to the lift pump. The tank is held by a couple of steel straps that are not difficult as long as you have something to support it. Use antisize when you replace the bolts. On some coaches there is access under the carpet in the front of the kitchen.


1993 32' Regency Wide Body, 4 speed Allison Trans, Front Entry door, Diamond Plate aluminum roof &
1981 Euro 22' w Chevy 350 engine and TH 400 tranny
 
Posts: 1505 | Location: Houston Texas | Member Since: 12-19-2006Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 4/08
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Diesel, Gasoline or Propane??


'92 Barth Breakaway - 30'
5.9 Cummins (6B) 300+ HP
2000 Allison
Front entrance
 
Posts: 1012 | Location: Minneapolis/Yuma | Member Since: 08-17-2006Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 1/18
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Richard has propane. They are camping and may not have WiFi


Dana & Lynn
1997 38ft Monarch front entry
Spartan Mountain Master Chassis
Cummins 8.3
Allison MD-3060 6 speed
22.5 11R
Cummins Factory Exhaust Brake
9608-M0022-38MI-4C
Christened Midnight

1972 22ft
Christened Camp Barth
 
Posts: 947 | Location: Waseca, Minnesota | Member Since: 12-09-2010Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/17
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as i played with the genset, I noticed that it ran great with no load but the minute I flipped the breakers on, it started to run really rough. Would it make sense to flush the regulators out with carb cleaner or gasoline?


R.P.Muise 1994 Breakaway/Cummins 5.9/Allison transmission/Spartan Chassis
 
Posts: 638 | Location: Hampden, Massachusetts | Member Since: 10-13-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 12/10
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I don't have experience with lp units but, big guys in the pool hall tell me the carb stays clean, but pressure regulator may suffer age but first and always check ignition side. Plugs, particularly gap and condition, wires, replace because they are pretty cheap. Clean the cap, dress the rotor and points.
Tim


Money can't buy poverty
 
Posts: 869 | Location: St. Charles, MO, USA | Member Since: 10-09-2003Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/19
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An internet search suggests that the slip rings can cause this problem as well .

http://forums.goodsamclub.com/...31112/print/true.cfm

http://blog.goodsam.com/cleani...and-brushes-part-19/
 
Posts: 62 | Location: Mooringsport,LA | Member Since: 05-30-2019Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/19
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Also check the governor rod for ease of movement , i read that they can stick from getting dusty.
 
Posts: 62 | Location: Mooringsport,LA | Member Since: 05-30-2019Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 10/08
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quote:
Originally posted by Richard_Muise:
Would it make sense to flush the regulators out with carb cleaner or gasoline?


NO The propane vaporizer has diaphragms that can be damaged by aggressive cleaners. If your vaporizer is mounted so the drain can be opened and the oily substance (used to add odor to the propane) can be drained that is the first step.

Second, check the spark plug gag, should be no more than 0.018", yes closer than for gasoline but propane is harder to light. The diaphragms may have failed in that case, a person familiar with vaporizers and have the proper equipment to rebuild and calibrate must be used!


Ed
94 30' Breakaway #3864
30-BS-6B side entry
230 Cummins, Allison 6 speed
Spartan chassis
K9DVC
 
Posts: 2143 | Location: Los Gatos, CA | Member Since: 12-08-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 6/17
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Well sportsfans, the genset is dead! ordered a 5500 Onan brand new today. Frig it. I ve had problems with this one for three years and my patience wore thin. ho needs money anyway?


R.P.Muise 1994 Breakaway/Cummins 5.9/Allison transmission/Spartan Chassis
 
Posts: 638 | Location: Hampden, Massachusetts | Member Since: 10-13-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 5/10
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While you are on a shopping spree buy new lines too (if you going propane). On our Beaver they started leaking from old age


1999 Bluebird Custom 33' 8.3 Cummins diesel pusher
2002 Toyhauler w/7.3 diesel
Former owner 1989 Barth Regal 25'


 
Posts: 1293 | Location: Big South Fork TN | Member Since: 09-29-2009Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 3/19
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generators need to be "exercised" at regular intervals, under load, or they die. nono A former owner of my FT neglected to do that, resulting in $ten coach buck dynamo replacement. confusion What Dave Ramsey calls "Stupid Tax" D'oh
come to think of it hmm .... I better go out and run mine right now
 
Posts: 2013 | Location: Jackson, Michigan, USA | Member Since: 04-18-2004Reply With QuoteReport This Post
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