juicebronco
Seaman
- Joined
- Jun 17, 2011
- Messages
- 64
First let me say this was a motor I picked up that I don't know the history of, I did a bunch of work to get it going prior to installing it as a replacement to my blown 470. I have around 100 miles (no hour meter) so depending in speeds 5-10 hours is my guess.
So I have an 83 470 that seems to be vapor locking. I was out yesterday, stopped for a while, then I went to restart it, it fired up fine, I started driving and it died on me, like it ran out of fuel. SO I check, no fuel getting to the carb, so it's for sure a fuel issue. I checked the filters and blew through the lines and what not, and I couldn't get it go, so I figured it was the pump. I took it apart as far as I could on the boat, and it seemed fine, I put it back together and nothing. I got towed off the lake.
Today, I took it apart, cleaned it up, made sure everything worked good, blew/sucked on it to test the check valves, primed the pump from a separate tank, installed it, and fired it up on the trailer. Seemed to be running good, so I took it out for a test ride. Drove around for 20-30 minutes or so, and shut it off to go swimming, and test the same issue I had yesterday with dying after restart. After sitting half hour or so, I started it up, and it started easy. I went to start driving and it seemed to run out of fuel again. Immediately checked, and no fuel getting to the carb, pulled the line off the intake to the pump and it was dry. My solution was to pull the pump off, bypass the water separator filter, and put the line directly on the tank, and prime it by hand. Once I had fuel in the pump, I hooked it back up, and it started and ran fine, but I headed back home, and started researching.
So Warm engine, restarts, then dies. No fuel in lines. Prime the pump and it works again.
To me it seems like it's vapor locking in the lines, and the pump is losing prime, the engine fires on what is left in the carb, then runs out when that empties.
I've read about idling the motor prior to shut down, and running the blower after shut down for a bit. Opening the doghouse isn't a realistic option to do when people need places to sit.
Maybe related- when I first launch, it tends to want to not open up, I can idle, but if I try and get it up on plane it will start to starve for fuel. cough a little, then i need to work the throttle in neutral to get it running smooth again. I figured it was a cold engine thing, but it did it as well today, after warming it up on the trailer at home, then taking it down to the lake. Once I get it going it runs great with no stumbles. I figure it is a carb issue, but figured I would mention it.
So I have an 83 470 that seems to be vapor locking. I was out yesterday, stopped for a while, then I went to restart it, it fired up fine, I started driving and it died on me, like it ran out of fuel. SO I check, no fuel getting to the carb, so it's for sure a fuel issue. I checked the filters and blew through the lines and what not, and I couldn't get it go, so I figured it was the pump. I took it apart as far as I could on the boat, and it seemed fine, I put it back together and nothing. I got towed off the lake.
Today, I took it apart, cleaned it up, made sure everything worked good, blew/sucked on it to test the check valves, primed the pump from a separate tank, installed it, and fired it up on the trailer. Seemed to be running good, so I took it out for a test ride. Drove around for 20-30 minutes or so, and shut it off to go swimming, and test the same issue I had yesterday with dying after restart. After sitting half hour or so, I started it up, and it started easy. I went to start driving and it seemed to run out of fuel again. Immediately checked, and no fuel getting to the carb, pulled the line off the intake to the pump and it was dry. My solution was to pull the pump off, bypass the water separator filter, and put the line directly on the tank, and prime it by hand. Once I had fuel in the pump, I hooked it back up, and it started and ran fine, but I headed back home, and started researching.
So Warm engine, restarts, then dies. No fuel in lines. Prime the pump and it works again.
To me it seems like it's vapor locking in the lines, and the pump is losing prime, the engine fires on what is left in the carb, then runs out when that empties.
I've read about idling the motor prior to shut down, and running the blower after shut down for a bit. Opening the doghouse isn't a realistic option to do when people need places to sit.
Maybe related- when I first launch, it tends to want to not open up, I can idle, but if I try and get it up on plane it will start to starve for fuel. cough a little, then i need to work the throttle in neutral to get it running smooth again. I figured it was a cold engine thing, but it did it as well today, after warming it up on the trailer at home, then taking it down to the lake. Once I get it going it runs great with no stumbles. I figure it is a carb issue, but figured I would mention it.