Can I fill a marine fuel filter with Marine PRO to clean the engine after it’s been sitting with a 1988 OMC 4.3 L? [SOLVED]

1 Answers

Hi, just wanted to double check and make sure I am reading the recommendation correctly.
It’s ok to fill the main spin on fuel filter with 100 percent marine sea foam pro to perform a deep clean of the fuel system ?
The engine will start and run with Sea Foam alone before the fresh fuel is mixed in with it ?
I’ll be performing this on a 1988 OMC 4.3 L marine engine that has been setting for a few years.
Thanks, Mark

Asked by Mark W. In Maryland

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Jim D.TECH
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Official Answer

Hi Mark,

Thanks for the question!

Yes, that’s a great way to perform a deep cleaning on an engine that has been sitting.

Here’s what I’d do:

• Add Marine PRO to the fuel tank at a cleaning concentration (at least 2 oz per gallon of fuel). It’s best if the tank is relatively low to maximize the treatment concentration.

• Start the engine and bring it up to operating temperature, then shut it off.

• Remove the old fuel filter and install a new one filled about 3/4 full with Marine PRO.

• Start the engine and let it idle for about 5 minutes to pull the high concentration of Marine PRO through the fuel system.

• Shut the engine off and let it soak for about 10 minutes.

• Restart the engine and run or operate it for at least another 10 minutes.

Fuel gum and varnish is the #1 cause of many fuel-related performance problems in marine engines that have been sitting. The high concentration of Marine PRO works very well to liquefy and clear away those deposits.

Answered by Jim D. TECH