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Old 03-21-2019, 10:26 PM   #1
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Advice on gas rig that's been sitting

My brother is getting a 2002-2003 Allegro Bay from his father in law. I don't believe its been used and maybe even started in 6 years. The fuel tanks are half full. He plans to have a mechanic change the motor oil and filters, tranny fluid/filters and install new batteries for house and chassis. Question is mostly about the fuel. Is it possible to fill the tanks with fresh gas and add some seafoam or does he need to have them drained? Tires are about 7 years old so they may need changing. The coach is in Amarillo and he lives in Houston. I'll make sure he has roadside service with Coachnet or another. Suggestions welcomed.
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Old 03-22-2019, 03:31 AM   #2
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Drain the tanks. The gasoline in them will be bad. Fuel filter(s) should also be changed.
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Old 03-22-2019, 03:43 AM   #3
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You can certainly try and fill with fresh and hope for the best or drain the tank and start with a full tank of know good fuel and not worry about it. Lot of empty highway between Amarillo and Houston. Save the old gas for use in the lawn mower and mixed at a better ratio than 50/50.

And have the mechanic check the brakes to ensure no sticky pistons that will cause a brake to drag. Brake fluid is probably due for a change also.
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Old 03-22-2019, 04:18 AM   #4
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Drain all fluids and replace with fresh. It most likely will save you a lot of trouble in the long run.
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Old 03-22-2019, 05:43 AM   #5
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I wouldn't use gas that old in anything... small engines would be my last choice.
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Old 03-22-2019, 05:55 AM   #6
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I have to agree with the "drain it" suggestion. Today's gas has a problem lasting one year no less 6. I think you will be better off starting off fresh at least you can eliminate that question if you have a problem waking this thing up, but I don't think you will. Happy motoring.
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Old 03-22-2019, 06:25 AM   #7
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Unfortunately, there is no way that gas is going to be fine. Drain it for sure! Fresh gas, changing the fuel filter, and plugs is the only way to insure against what could be a bad trip home. I know there are believers and non believers, but I would also put a can of seafoam in the freshly filled gas tank. This stuff has done well on many resurrected motorcycles that I've revived. I've had nothing but positive results using it. At least I believe so. Best of luck!
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Old 03-22-2019, 10:29 PM   #8
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Thanks guys.
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Old 03-23-2019, 12:28 AM   #9
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I would start it up and if it runs I'd go top it off with gas and add several cans of Seafoam. Each can treats about 13 gallons.

I'd burn through that complete tank and once again add several cans of Seafoam and fresh gas. On the second tank I would start the generator, assuming it has one, and run it for at least an hour so the Seafoam can do it's thing.
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Old 03-23-2019, 10:16 AM   #10
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I would start it up and if it runs I'd go top it off with gas and add several cans of Seafoam. Each can treats about 13 gallons.

I'd burn through that complete tank and once again add several cans of Seafoam and fresh gas. On the second tank I would start the generator, assuming it has one, and run it for at least an hour so the Seafoam can do it's thing.
Agreed. At least give it a try to see if the old gas is any good. I have bought some vehicles that were sitting a long time. Biggest problem was blocked fuel flow and dried gas in the carburetor or fuel injectors. You need the seafoam to break up the dried gas residue so use the old gas to do that.
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Old 03-23-2019, 11:58 AM   #11
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Change out the tires, sitting for 7 years plus the age on them before the MH was parked means they are most likely dry rotted.
+ 2 on the brakes as well, chances are one or more will freeze up when itís used.
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Old 03-23-2019, 01:02 PM   #12
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Change out the tires, sitting for 7 years plus the age on them before the MH was parked means they are most likely dry rotted.
+ 2 on the brakes as well, chances are one or more will freeze up when itís used.
I agree, the tires can really cause a problem.
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Old 03-23-2019, 03:07 PM   #13
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If the gas is/was ethanol it has likely absorbed enough water to phase separate. Before I did anything I would drain s few gals and look at the color and clarity. If it's ugly looking I'd hesitate to get any of it into injectors etc... could cause more $$$ problems.
Disconnect fuel lines and try to pump some into a glass container. The repair could be many more X the value of X gals of fuel.... is it really worth even trying it??? Wouldnt be to me.
I recently had s shop drain a boat fuel tank fof similar situation/ reasons. Shop mechanic said the stuff they got out was pretty ugly looking.
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Old 03-24-2019, 08:37 AM   #14
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Advice on gas rig thatís been sitting

Donít overlook the GenSet on the coach. I assume it has not been exercised monthly? At a minimum, oil & filter and air filter, plugs. Depending on hours on the GenSet counter, may need valve adjustment.
Last, Iíd have a qualified tech look at the GenSet before I put an electrical load on it.
And donít drink any water before new house filters, flush system (including ice maker) and sanitize the fresh tank.
If you have hydraulic levelers or slides, you may consider flushing the hydraulic fluid reservoir and lines, especially if youíre flushing the brake system & tyranny.
Best Regards!
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