Majek RFL
Recruit
- Joined
- Jan 18, 2023
- Messages
- 5
I bought this boat and 700 hour engine a few months ago- I rewired the entire boat. Then, I was out fishing one night and it quite running at idle. Had to get towed in. I found a couple of issues with the fuel system then-the pickup tube in the tank was only 15 inches in an 18 inch tank, and I had a about 4 inches of fuel at the time. Also, the engine fuel filter plastic housing was cracked.
While troubleshooting this, since it was an old engine, I wanted to make it as reliable as possible so I replaced the following parts.
All new fuel hoses
New pickup tube in tank
New squeeze bulb
New high pressure fuel pump
Cleaned VST and filter
New low pressure fuel pump
New fuel filters all around
New fuel pressure regulator
New thermostat
New spark plugs
Oil change
I continue to have a problem with the engine not starting when hot. Today I ran it on a long run slowed down and idled a few minutes and shut it down, but it will crank but not start. I pumped the bulb which only took a couple of squeezes to get tight. Depressing the schrader valve on the fuel rail yields air and fuel, almost an atomized mist. I wasn't able to start it until I had someone crank it while purging the air from the shrader valve. I've also had an issue where I was able to pump the bulb and keep it running, but it seems to correct itself after a minute of this.
The engine runs great when it runs, I ran it for hours today with no issues until I stop and try to restart it.
I am at wits end trying to fix this myself. I also just had to replace the lower unit because the gear carrier nut threads stripped out when we removed it to repair some corrosion on the drive shaft due to bad seals. I have the winky blinky yamaha tool I am going to hook up to it, and I am going to buy a fuel pressure tester to check it. I suspect there is a temperature sensor acting up, but the air in the fuel rail is throwing me off. I am wondering if anyone has any ideas or tips to help.. Thank you-this is driving me nuts!
While troubleshooting this, since it was an old engine, I wanted to make it as reliable as possible so I replaced the following parts.
All new fuel hoses
New pickup tube in tank
New squeeze bulb
New high pressure fuel pump
Cleaned VST and filter
New low pressure fuel pump
New fuel filters all around
New fuel pressure regulator
New thermostat
New spark plugs
Oil change
I continue to have a problem with the engine not starting when hot. Today I ran it on a long run slowed down and idled a few minutes and shut it down, but it will crank but not start. I pumped the bulb which only took a couple of squeezes to get tight. Depressing the schrader valve on the fuel rail yields air and fuel, almost an atomized mist. I wasn't able to start it until I had someone crank it while purging the air from the shrader valve. I've also had an issue where I was able to pump the bulb and keep it running, but it seems to correct itself after a minute of this.
The engine runs great when it runs, I ran it for hours today with no issues until I stop and try to restart it.
I am at wits end trying to fix this myself. I also just had to replace the lower unit because the gear carrier nut threads stripped out when we removed it to repair some corrosion on the drive shaft due to bad seals. I have the winky blinky yamaha tool I am going to hook up to it, and I am going to buy a fuel pressure tester to check it. I suspect there is a temperature sensor acting up, but the air in the fuel rail is throwing me off. I am wondering if anyone has any ideas or tips to help.. Thank you-this is driving me nuts!
Last edited: