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Question about a primer start system on a 2003 Mercury 4stroke 90hp (it’s really a Yamaha powerhead). I purchased the boat about 4 years ago and it always started with just a touch of the key. In January, my fuel pump died. Replaced the pump – the motor started but ran like crap. The thought was...

Even gas without ethanol becomes stale -- the higher octane helps to boost the octane level. The gas has been sitting since 2018. New DOE Study: Gasoline becomes stale before ethanol phase separation occurs In Colorado, a study conducted by DOE’s National Renewable Energy Laboratory (NREL)...

I'd pick-up a inexpensive siphon pump and remove the gas from the tank. I pump the gas in a gallon jug, so I can look to see if there is any ethanol separation -- if not, I'll top off the gas in my truck. The crap that separated, I take to the recycle center.

power for the ignition switch does not come from the fuse box. The are two separate circuits/wiring harnesses; one for the ignition/motor/trim and the other for lights/pumps and accessories. Sound like the lights/pumps/accessories circuit is okay. First step is to see if the power is making...

Recently purchased 2003 Nitro 1900 tunnel hull with a Mercury 90 hp 4 stroke mounted on a 6" jackplate -- according to previous owner boat has always had issues getting on plane. Current prop is 13x19, three blade. Engine at 4000 rpm (~20mph) will get boat on plane -- take a long time. The...