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Old 07-05-2022, 08:17 PM   #1
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starting engine after 32 months

Hi there, I have a 2017 American Coach with a 8.9 Cummins stored in Southern California since November 2019.
I live overseas and haven't been able to return to the USA due to Covid so the engine hasn't been started during that time.
Before storing, the fuel tank was filled and a diesel bug treatment was included with the fuel. All batteries were physically disconnected at the batteries.

My query: Is there any precautions to take before attempting to start the engine? And should it start ok?

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Old 07-05-2022, 08:26 PM   #2
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Fully charge the batteries then load test them ; check all fluid levels , check air filter and exhaust for nests of bugs , birds or rodents .
Cycle the key on and wait 30 seconds , turn key off and repeat , several times to prime the fuel system by giving the lift pump time to prime the fuel injector pump .
Attempt to start .
If you didn't change the oil prior to storage , run engine to full operating temp and then change the oil & filter.
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Old 07-05-2022, 08:38 PM   #3
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The only problem you might encounter is dead batteries from sitting that long uncharged. Other than that, being diesel, it should start up with out too much cranking. Before starting make sure the batteries are charged, and when first turning on the key wait 30 seconds for the electric fuel pump in the tank to charge the fuel lines. Once started, let it idle til full oil pressure is shown on the gauge. Also the tires will need airing up from sitting so long, and they will have flat spots and will ride rough for the first hundred miles till they get fully warmed up and start to round out. As long as the fuel was treated with a biocide when stored, it should not have any microbe growth to worry about. If not, then buy extra fuel filters to take with you on your first trip and add a biocide at 3X the normal strength to kill off any microbes.
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Old 07-06-2022, 06:20 AM   #4
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Extra fuel filters would be wise.
I'd also cycle the key several times to make sure the system is primed.
Try starting the rig and just watch the gauges to makes sure everything looks good, especially the oil pressure.

You might consider sending in an oil sample for analysis and change the oil based on this.

I don't think you will have a problem.
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Old 07-06-2022, 01:20 PM   #5
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That year Cummins has a built-in oil pressure/starter function. The engine will rotate but not start until the ECM "sees" engine oil pressure; that means nothing special to do before starting the engine except insuring oil level is OK.
Drive slower the first 20 miles or so to allow wheel bearing, diff., and other oil/grease lubricated parts to be fully coated before any high speed driving.



Drain the water separator after 15-30 minutes of the engine running, JIC there is water in the fuel tank. Buying and carrying spare fuel filters is a great suggestion IMO.
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Old 07-06-2022, 04:56 PM   #6
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Not so sure any treatment lasts 3 years. You could have a fuel polisher come out and clean the fuel in the tank first.
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Old 07-06-2022, 08:09 PM   #7
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Quote:
Originally Posted by shootist View Post
Not so sure any treatment lasts 3 years. You could have a fuel polisher come out and clean the fuel in the tank first.

Diesel fuel used in military vehicles is treated with a BioBor JF equivalent when sold to the government. This fuel routinely sits in storage tanks for years before being used with no problems. Like the diesel fuel, it doesn't break down with age.
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Old 07-07-2022, 01:31 AM   #8
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If no water in diesel fuel, I would expect no problems?
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