Tartan 27' owner
Join Date: Jan 2008
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Re: Atomic 4 cutting out in forward.
If you have an electronic fuel pump instead of the original mechanical fuel pump this setup requires an oil pressure safety sensor (OPSS) that will cut off current to the pump if the oil pressure is not high enough. This can cause the engine to cut out.
There are 2 modes of failure you might experience with the electronic fuel pump.
1 - you might have low oil pressure and the sensor cuts off current to the fuel pump as it is designed to. This is a safety feature so you don't end up with a lot of gasoline pouring out of your carburetor.
2 - the oil pressure sensor itself can be faulty and may shut off current to the fuel pump for no apparent reason causing the engine to shut down.
You can test this by running a line from the pos. (+) side of your 12V system directly to your fuel pump. If it does not stall out when hot wired then the likely culprit is the OPSS. Beware of pumping too much gas to the carb while doing this.
If you have the mechanical fuel pump (operates only when the engine rotates) then disregard the above as it is likely some crud blocking one of the small passages in your carb. I'd suggest that you do not use your on board fuel tank as that is the likely source of crap getting stuck in your carb. Your outboard tank should have cleaner gasoline in it then a tank that has been sitting for who knows how long.
Here is what I found at the bottom of our 20 gallon on board gas tank after pumping it out. You can thank your government for subsidizing ethanol in gasoline (E10) for this phase separation issue. You can also thank the corn farmers in the midwest and their lobbies.
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Last edited by CalebD; 05-31-2012 at 11:47 PM.