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harvey lee

50 hp 4 stroke fuel problem

Question

harvey lee

On my new boat I have a problem with air getting in my fuel supply I believe. Since new this spring, at full throttle it will go along just fine and then loose speed and power. if I go back and pump up the primer bilb it picks right back up. I took it to the dealer and they thought it was the o-ring in the connector. That didnt do it. If I am having a problem, then I can release the connector from the motor and re connect and its fine again but just doesnt seem to have the full power. I have taken off the motor cover and checked all the fuel lines with the primer bulb pumped up very hard and see no leak in any line and the pressure holds.

I'm going back to the dealer tommorrow and was wondering if anyone had any ideas? Maybe the fuel pump or what?

One other thing, the first time it leaked and didnt run right it leaked by the furl line connector to the motor. They put a new o-ring in the connector and that stopped the fuel leak by that area.

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Eric Wettschreck

I had a 35 Johnson that acted this way. It turns out the fuel line connecter at the fuel tank was leaking, just a tad, but enough to allow it to suck air.

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Scott K

I had a 2000 40hp merc 2 stroke, same thing, I brought it to the dealer several times, after a new tank, hose, I told them that it needed a fuel pump, they put it in and it fixed my problem.

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Shack

Harveylee,

If I was in Vegas, I would bet fuel pump. First off, because of leak found already. The chances they missed another leak are slim (but still there). Second, air going through fuel pump could weeken/over heat fuel pump. It would be intresting to hear what dealer finds.

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harvey lee

Here's the fix. The fuel line coming from the tank to the connector that clips to the motor was loose. They crimp it and it appears that it was crimped to tight and it lifted inbetween two crimps and it leaked a little air at high speed. The put a gear clamp on that and also put the right prop on the boat. It came with a prop for a bigger motor by mistake. Now, I have 800 more rpm's, goes 7 mph faster and planes out very nice and doesnt hesitate any more.

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harvey lee

Today i found out the real problem, fuel pump. There were numerous issues but the final fix is the fuel pump.

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  • Your Responses - Share & Have Fun :)

    • Wanderer
      That’s pretty awesome! I’ve been keeping an eye out around the house but haven’t seen enough activity to coax me out in the temps we’ve been having.  We mainly have fox around the house, and only one good yote.  We had a young wolf do a lap around the house in the spring but haven’t seen him around since.  I know I couldn’t shoot him but I’d sit out just to see him if he started showing up again. Mainly turkey tracks as of late.  
    • Wanderer
      Probably two of the safest bets in the area. I haven’t fished Crooked off Bunker for several years but it always seemed to have plenty of fish. Have you ever been on the Moore lakes near 65 and 694?  Sometimes they get a lot of attention, and I’d have to think for good reason.   Twin Lakes in Robbinsdale used to be a favorite stop for us when we were young.  Did good on pannies and surprisingly well on pike. If you don’t mind traveling further west, Medicine is a pretty good lake.  Lots of memories fishing the crappie hole in front of the beach on the southwest side.
    • PRO-V
      Gulp spray seems to help also.
    • Wanderer
      I prefer ciscoes too.  I just don’t always have access to them.  They leave a better scent trail.  That’s part of the reason for a little kick of salt on the frozen suckers.  Anise could help too.
    • Hawg
      Not that I know of. First time I used one and constantly had to clear the shavings and drill kept cutting out. Drill is a 1200# fuel. 
    • PRO-V
      I always did best with frozen Cisco's suspended on a quick strike rig.
    • PRO-V
      I tried a few times during that 30 below weather. Saw nothing but thousands of wolf tracks. That night while we sat on the hunting shack deck having a cigar a pack of coyotes we're yipping out by our trucks 400 yds away. They were probably tipped off by our generator though and couldn't get them to come in. I did see 2 moose 30yds in front of me going into one calling spot. That was cool.
    • going4it
      Coon lake up 65 and off 22. Also Lake George. Both pretty good panfish populations to keep busy. 
    • Brandon Klatt
      Thanks for the replies guys. Usually target panfish and eyes so actually going for pike is kinda a whole new world to me. lol
    • mrpike1973
      Lots of little sunnies there is a spring in there in the deepest spot be care full. There are better lakes in my opinion.
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