boat cranks but wont start
Ok. I have a 2002 Outback LS carb engine. Last week boat started to die out on water. Kept acting like I was out of gas. Finally got it on the trailer, aand brought it home. Changed the fuel filter and just triued to take it back out. Cranks but no fire. Oil pressure is showing on the gauge when I crank. I am thinking bad fuel pump, but not sure how to test it.
boat cranks but wont startr
Air fuel and spark...start with spark, then verify fuel with a fuel pressure gauge or test light, then check compression. If you have all three it should run
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Re: boat cranks but wont startr
Did you check the oil pressure sensor?
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boat cranks but wont startr
For basic diagnostic: If its a Holley carb start by taking off the flame arrestor on top of the carb. Have someone pump the throttle while you look down the carb, paying attention to the front two barrels. When the throttle is pumped you should see a stream of fuel come from the squirter, which is located between the two front barrels towards the front of the barrels with a Phillips head screw on top. The stream of fuel will hit the venturi, the little round thing in the middle of each barrel. For the sake of basic diagnostics if it squirts you have fuel.
Next check your spark. Remove a spark plug, put the wire back on it and hold the head of the plug against the block or anything else metal. Keep your fingers on the plug boot so you don't get a zap from the coil, and have someone try to start the engine. You should see the plug sparking as the engine turns over.
Try this and report back!
boat cranks but wont startr
Just so I got this straight, the boat runs fine if you keep pushing the start button? Do you have any pics of the wiring that is spliced at the back and the back of the push button?
I would be looking to undo all the shotty work and fix any wiring that was cut into with solder and heat shrink tubing. I would also be removing the push button and trying a temp key or hot wire to eliminate it as the problem.
boat cranks but wont startr
If the pump doesn't prime when you turn the key from off to on (not all the way over to hit the starter) then your problem is in the wiring. It should prime for a couple seconds then stop until you start it, then it stays on. This would explain why it shuts off when start is released, 12v to the fuel pump is being cut too. Somewhere down the line power to the fuel pump and likely the ignition are wired incorrectly.
boat cranks but wont startr
Should be somewhat straightforward to trace down with a multimeter and wiring diagram.