Please forgive the length of this post but I'm trying to post every detail of what my problem is.
I've been using a 1975 pull start 40 hp Evinrude for the past 6 years. I always said I would convert her to electric start should she ever give me problems but since it always started with one or three pulls I didn't see the need to convert (but this not the issue). My issue is why it won't start.
Background;
The motor is mounted on 16 ft center console with a built in 20 gallon fuel tank. The tank has an anti-siphon valve at the top where the fuel line attaches to that runs to a primer bulb that is connected of course to the motor.
I had left some gas in the tank that I forgot to treat with sta-bil when I put the boat away last fall. I DID drain the fuel from the carb bowl last fall. So not wanting to use the old gas, I pumped it out using a 12 volt pump and replaced it with fresh fuel.
I attached the water hose, squeezed the primer bulb and pulled the choke lever. After about 10 pulls on the starter rope, I knew something was amiss. The primer bulb was hard as a rock but I wasn't hearing fuel entering the carb. I took off the carb, removed the bowl and sure enough the metering the vavle was stuck. Sprayed it with some carb cleaner and slapped it back on. Squeezed the primer and now I could hear the fuel entering the carb. Pulled the starter rope and still nothing. Puzzled and because I have access to quite a few parts, I changed the fuel pump (just on a hunch). Pulled the starter and it fired up and ran just like she always does. Good to go.
Next morning, I put the boat in the water and it fires right up. I putt-putt out the no wake zone and take off at full throttle. I get to my favorite crabbing area and as soon as I come off full throttle it dies and won't restart. I mess the fuel system for about an hour to no avail. On another hunch and because I didn't feel like rowing, I decide to remove the saftey feature (kids don't try this at home) on the pull starter that will only allow you to pull the starter in neutral. I put the boat in forward, open the throttle wide open and pull the starter. I nearly get thrown out of the boat, coffee goes flying, and the motor hood almost goes for a swim (I was lucky on that one, it got caught on my trotline rig).
Runs fine all the way back to the pier at full throttle. Soon as I come down off WOT, it dies. Now, I have had trouble with the primer bulb in the past. Sometimes when the motor hasn't been started in awhile I have to dissemble the bulb because it seems like one of the check valves gets stuck. Bearing this in mind and the fact it acts like it won't hold a prime, I install new primer bulb. Attach the water hose, pull the starter and still nothing. At my wits end, I decide to put it in forward and move it throttle to wide open (knowing full well it was probably going to come back to haunt me at some point). Lo and behold, she fires up I immediately move the throttle back to idle speed and it continues to run. I get a can of carb cleaner, set the throttle up a few notches and spray the cleaner into the carb in pulses making it sure the motor doesn't stall while I'm spraying. Good to go now, right?
Back to the water I go. Dump the boat in water, fires up on first pull. Go wide open out to my crabbing spot again. Come off full throttle and shes purring like a kitten. Put my first line down (about 15 minutes) and was getting ready to run it and the motor dies, again. Pull the hood off and I immediately knew something else was wrong. I could smell paint burning and could feel heat coming off the motor. Rats man, I ran it hot! Stupid impeller must have went. I row for a good hour and a half before attempting to start it again. Once I thought it was cool enough I fired it up and nursed it back to the pier.
The good news here was at least I got the fuel problem licked, bad news is of course I ran the thing hot, twice . I take it home, remove the lower unit and inspect the impeller baldes. Blades were fine but it was spun, just like a prop gets spun The blades separated from the keyed ring. Ring was turning, blades were not. I knew that no-load situation I put it in in the driveway was going to come back to haunt me. Change the impeller, fire it up, runs like a top. Back to the river go I (hell bent on catching some crabs).
Fires up, I run out to the crab line I left. Come off full throttle, purring like a kitten. Run out at full throttle to another spot, idles right down, running good. I continue this sequence, running at full throttle for a few minutes than idling for about 20 minutes, three times. On the third time, coming off full throttle it dies again. Pull the hood, motor is nice and cool. Start messing with the fuel system again, nothing. Put the boat in forward and move the throttle to wide open (I'm more prepared this time) and it takes off. I run back to the pier, come off full throttle and it dies again.
That was about 11 days ago. Here is what I've done to it since:
Checked for spark, got it.
Replaced anti-siphon valve (ASV)
Clean and inspected the pick up fitting that ASV attaches to.
Unhooked fuel supply line from carb;
Squeezed primer, I got fuel
Pulled starter rope, fuel spurts
Checked compression, exactly 100 psi in both
Installed new carb
If I spray carb cleaner into carb, it will fire but only runs on the carb cleaner than quits.
What am I missing, what am I forgetting? Any advice (besides converting to electric start) or ideas would be greatly appreciated. I am stumped, my hands are blistered and my arms are sore.
Thanks
T.Rally
I've been using a 1975 pull start 40 hp Evinrude for the past 6 years. I always said I would convert her to electric start should she ever give me problems but since it always started with one or three pulls I didn't see the need to convert (but this not the issue). My issue is why it won't start.
Background;
The motor is mounted on 16 ft center console with a built in 20 gallon fuel tank. The tank has an anti-siphon valve at the top where the fuel line attaches to that runs to a primer bulb that is connected of course to the motor.
I had left some gas in the tank that I forgot to treat with sta-bil when I put the boat away last fall. I DID drain the fuel from the carb bowl last fall. So not wanting to use the old gas, I pumped it out using a 12 volt pump and replaced it with fresh fuel.
I attached the water hose, squeezed the primer bulb and pulled the choke lever. After about 10 pulls on the starter rope, I knew something was amiss. The primer bulb was hard as a rock but I wasn't hearing fuel entering the carb. I took off the carb, removed the bowl and sure enough the metering the vavle was stuck. Sprayed it with some carb cleaner and slapped it back on. Squeezed the primer and now I could hear the fuel entering the carb. Pulled the starter rope and still nothing. Puzzled and because I have access to quite a few parts, I changed the fuel pump (just on a hunch). Pulled the starter and it fired up and ran just like she always does. Good to go.
Next morning, I put the boat in the water and it fires right up. I putt-putt out the no wake zone and take off at full throttle. I get to my favorite crabbing area and as soon as I come off full throttle it dies and won't restart. I mess the fuel system for about an hour to no avail. On another hunch and because I didn't feel like rowing, I decide to remove the saftey feature (kids don't try this at home) on the pull starter that will only allow you to pull the starter in neutral. I put the boat in forward, open the throttle wide open and pull the starter. I nearly get thrown out of the boat, coffee goes flying, and the motor hood almost goes for a swim (I was lucky on that one, it got caught on my trotline rig).
Runs fine all the way back to the pier at full throttle. Soon as I come down off WOT, it dies. Now, I have had trouble with the primer bulb in the past. Sometimes when the motor hasn't been started in awhile I have to dissemble the bulb because it seems like one of the check valves gets stuck. Bearing this in mind and the fact it acts like it won't hold a prime, I install new primer bulb. Attach the water hose, pull the starter and still nothing. At my wits end, I decide to put it in forward and move it throttle to wide open (knowing full well it was probably going to come back to haunt me at some point). Lo and behold, she fires up I immediately move the throttle back to idle speed and it continues to run. I get a can of carb cleaner, set the throttle up a few notches and spray the cleaner into the carb in pulses making it sure the motor doesn't stall while I'm spraying. Good to go now, right?
Back to the water I go. Dump the boat in water, fires up on first pull. Go wide open out to my crabbing spot again. Come off full throttle and shes purring like a kitten. Put my first line down (about 15 minutes) and was getting ready to run it and the motor dies, again. Pull the hood off and I immediately knew something else was wrong. I could smell paint burning and could feel heat coming off the motor. Rats man, I ran it hot! Stupid impeller must have went. I row for a good hour and a half before attempting to start it again. Once I thought it was cool enough I fired it up and nursed it back to the pier.
The good news here was at least I got the fuel problem licked, bad news is of course I ran the thing hot, twice . I take it home, remove the lower unit and inspect the impeller baldes. Blades were fine but it was spun, just like a prop gets spun The blades separated from the keyed ring. Ring was turning, blades were not. I knew that no-load situation I put it in in the driveway was going to come back to haunt me. Change the impeller, fire it up, runs like a top. Back to the river go I (hell bent on catching some crabs).
Fires up, I run out to the crab line I left. Come off full throttle, purring like a kitten. Run out at full throttle to another spot, idles right down, running good. I continue this sequence, running at full throttle for a few minutes than idling for about 20 minutes, three times. On the third time, coming off full throttle it dies again. Pull the hood, motor is nice and cool. Start messing with the fuel system again, nothing. Put the boat in forward and move the throttle to wide open (I'm more prepared this time) and it takes off. I run back to the pier, come off full throttle and it dies again.
That was about 11 days ago. Here is what I've done to it since:
Checked for spark, got it.
Replaced anti-siphon valve (ASV)
Clean and inspected the pick up fitting that ASV attaches to.
Unhooked fuel supply line from carb;
Squeezed primer, I got fuel
Pulled starter rope, fuel spurts
Checked compression, exactly 100 psi in both
Installed new carb
If I spray carb cleaner into carb, it will fire but only runs on the carb cleaner than quits.
What am I missing, what am I forgetting? Any advice (besides converting to electric start) or ideas would be greatly appreciated. I am stumped, my hands are blistered and my arms are sore.
Thanks
T.Rally