|
| Author |
Message |
    
miro forest
Senior Member
Username: miro
Post Number: 1089
Registered: 11-2001
| | Posted on Thursday, July 23, 2020 - 09:26 am: | 
|
This summer, I have taken the fantail launch out for longer cruises. But I found that after about 30-40 minutes , the engine would get starved of fuel and backfire.
This was disconcerting especially when I was out on the lake some distance from home. I eventually got the engine running again, by squirting fuel into the small port on the Schebler carb where fuel float vale is visible.
Clearly this is not a good thing ! What to do ? ?
Answer: lowwer the carb so there is more "fall" between the tank and the carb.
To say the least it is a bit tight for space in my boat.
But with some careful measurements and machining I managed to create an intake "manifold" that lowered the carb about 3 in.
I took the boat out and ran it for over an hour, with only a 1/4 tank of fuel - problem solved !
I was inspired by JB's installation in his bateau.
So , as per usual, Thank You, JB !
miro
You can see the intake is really close to the hull.
here's a picture of the layout of the engine area.
Here's a picture of the fuel tank. Taking the boat floor as a reference, and the other pictures, you can see that there was about 10-12in "fall" to the original carb mounting.
 |
miro forest
Senior Member
Username: miro
Post Number: 1090
Registered: 11-2001
| | Posted on Saturday, July 25, 2020 - 05:07 pm: |
|
I took it out for a run today - about 1 hour - ran just fine.
After about 5-10 minutes, I saw drops of condensation on the new "manifold". So it seems to be doing the job OK.
miro |
Narra Bay
Senior Member
Username: narrabay2
Post Number: 122
Registered: 10-2019
| | Posted on Sunday, July 26, 2020 - 06:22 pm: |
|
Very cool must have been glorious to be out there chugging along. Why did you have to replace the exhaust manifold? |
Jim Parrott
Senior Member
Username: jim_parrott
Post Number: 214
Registered: 06-2009
| | Posted on Monday, July 27, 2020 - 06:24 am: |
|
Miro,
You might want to turn your carburetor air horn pointing up. Ran mine pointed down for a long time til a engine backfire ignited a little bit of fuel that had collected in the bottom of my boat. Gets your attention really quick.
Jim |
|
|
|
|
