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The strange fact is that the engine starts fine when either cold or sitting after a run. Bad LP pumps doesn't explain that. Carb seepage might but they would have the draining when resting (and the motor would be hard to start cold) If after sitting and sitting for a while, the motor starts...

OK, that helps me eliminate one cause, carburetor drain off when the bowls are tilted. This one has me a bit stumped. Let's see what happens when the bulb is used.

Could be bad / dirty check valves. They can be cleaned without removing the helm box assuming you can get to the back of the unit. Another pain in the neck possible solution is to drain all fluid, refill with clean fluid and rebleed. That may help flush out any particles. It could also be a bad...

For info on pump out at station, this video will help I am not sure what the manual pump you see is for but I suspect it is a manual overboard pumpout through a seacock as mentioned.

At the beach do you raise the motors?

If you run it and stop for a short time, like 30 seconds, does it it start right up? If it sits for an hour, does it start right up? If it has issues starting after sitting for say 30 minutes and an hour, or more, I would lean towards fuel starvation issue in which case squeezing the primer...

yank on the cables at the lugs to see if any are corroded/loose. That can be tough to do if there is heavy shrink wrap on the cable ends. It is unlikely that you had a bad battery and the new one is also bad. If you are familiar with electrical things, the problem is easily isolated by measuring...

You don't know what is leaking assuming there is a leak. Do a few nose tests first. If you smell fumes when you first board the vessel, pull the forward tank assess plate and smell. If you don't smell fumes or the fumes are a lot less than when you first boarded the boat, the tank is not leaking...

If your loads draw anywhere near your breaker rating , your feed wire gauge is way too small. A short run of 12G (10 feet or so round trip) can handle about 15 amps continuous. Note too, that a larger cable size for the 12 volts adds nothing (but possible risk) if it is larger than the main...

Since it starts OK when cold but not when hot, my first thought was choke but that depends on whether the motor is carbed or injected. Next time as a test, when you have trouble starting the motor, turn off ignition and squeeze the primer bulb till firm (assuming it gets firm) and then try a...

Did you 'play' with the battery connections before you had the problem? ( for example, did you disconnect for the winter and just reconnected?) If so, make sure that the black battery cables that connects the two batteries together is actually connected at both ends. Bad battery switches are...

As alluded to, you haven't eliminated everything unless you pulled the tank out. Most leaks start on the underside where you can't see them easily. That said, it would help to know where you smell the fumes ( for example, everywhere but stronger if you pull the deck plate and sniff or not as...

Your hand can be used to feel for uneven cooling of the cylinder banks. Just be aware that the heads can get hot especially if overheating is occurring. If one t-stat is bad you will feel the difference in temperature but they won't necessarily tell you which bank is having issues. T-stats can...

This video may help In your case you will need a portable tank with a length of 3/8 in fuel line and connect it to the tank side of the primer bulb

Since your cooling system is 'open', not pressurized, the water can not get to 248 degrees, As Doc mentioned, the thermo switch will kick on way before that. My 2 stroke runs normally a lot cooler than you were told is normal. Those t-stats kick in at about 145 degrees. Also, on my motor a high...

My first thought was windlass.

Sounds like an overheat alarm. When did you determine that the pee stream was fine? Was if during the alarm or after you shut down and restarted? In the first case, you can get something like a plastic bag that plugs the water pickup but falls off after the boat comes to rest.

Don't leave the switch in both when away from the boat. When in both, the batteries may feed each other, one charging the other and vice versa. That is especially true if the batteries are not the same model or not the same age. The voltage reading at rest of 12.6 is fine. Note what the voltage...

Did you have the speed working with the old MFD? If so, then you probably have one of two issues: The new MFD needs to have the configuration changed to output the speed to the other device or the wiring for that information flow is not the same as the old MFD Depending on the old MFD and the...

The best advice was given already. Use your gauge as a reference. Just moving yourself or passengers aft will cause the gauge to read a higher level but you actual gallons hasn't changed. The one display that is a warning is one flashing bar as opposed to one solid bar. When that happens, you...