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Plugs wet all the time

L

Limeless

New member
I worked on my 1960 18 hp fastwin, this weekend. Its getting to much fuel. So; at warm idol I tried turning the slow speed jet in all the way. It made no difference to the engine. Questions, be side doing carb rebuild. Could the fuel pump be leaking into the crank case? When I disconnect the fuel line from tank to engine why does all the fuel leak out connection from the fuel pump?. Shouldn't there be a check valve in that fitting? I feel there could be several issues here.
 
It's an older motor and fuel will leak out of the connection because of no check valve in the connector. Newer motors have it. And yes, the fuel pump could have a ruptured diaphragm and be leaking into the crankcase.
 
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Thanks for the reply; Advice? should I just start with the carb, and go from there? it would be the least expensive. Or should I disconnect the fuel pump, and hook directly to the fuel line and primer bulb, and just pump the bulb as a fuel pump, and see what happens?
 
Does the carburetor flood or overflow when you pump the primer bulb when the motor is not running? If it does, you have a float or float valve problem.

Fuel pump diaphragm will flood one cylinder the one it is mounted on. Check by unscrewing it from the cylinder and squeeze the bulb. If gas squirts out the back side of pump, diaphragm is holed.

The little round cork gasket on the main nozzle in the center of the carburetor bowl, may be shot. In fact, that is likely.
 
Thanks, excellent advice! yes the one cylinder is wetter than the other, so it's like ones wet, and the other is very very, wet.
 
(Fuel Pump Diaphragm Test)
(Two Hose Type Only)
(J. Reeves)

Note: This pertains only to the regular Two Hose type fuel pumps.

Leave the hoses attached to the fuel pump. Remove only the two screws that attach the fuel pump to the powerhead. Re-insert those two screws and install a nut to each of them so that the fuel pump is securely clamped together. With the fuel line attached to the engine, pump the primer bulb while observing the pressure/vacuum operating hole on the back side of the fuel pump. Should any fuel leak out that hole, the diaphragm is faulty.

If the diaphragm is faulty, the fuel pump will require rebuilding or replacing. Note that repair kits are not available for all fuel pumps, in which case replacing the pump would be necessary.

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http://shop.ebay.com/Joe_OMC32/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
 
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