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Starting a recalcitrant new DLE (Read 4,419 times)
 
waverider
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Show the link to this post Starting a recalcitrant new DLE
Sep 24th, 2015 at 8:10pm
 
SOLUTION - origin Mike
The object is just to get the pump diaphragm, carb body, and inlet needle/seat wet with fuel mix. The surface tension of the fluids then help the diaphragm seal onto the carb body and to lubricate the inlet needle and seat, nothing is done on the metering side of the carb, just the pump side. Once this is done it will always work fine unless you run your carb dry and let it sit for a month or two.

Mine had the same problem when brand new. I pulled the cowl off and primed the engine the old-fashioned way....I squirted gas down the carb throat. It started. I later came to find out that the low-speed needle was too lean. (Thanks, Jody) I adjusted the needles and it is a great running engine.

loosen the four screws on the diaphragm cover on the carb.now pressurize the fuel tank until you see fuel coming out, under the diaphragm cover.while fuel is coming out tighten the four screws,now the carb is wet and will not siphon back into the tank.i bet it will start rite up

Pop off pressure has nothing to do with how a carb pulls fuel when choked.....The piston moving up creates a suction in the crankcase, which is what pulls the fuel through the fuel line...If the carb venturi is completely closed all that suction is acting on the fuel line...If there is a leak anywhere in the line or if the inlet needle is stuck closed there will be no fuel drawn....PERIOD....Take the cover off, the one with 4 screws....Gently push on the long end of the lever to un seat the needle...Put the gasket on the carb, then the diaphragm, then the cover...
Cover the venturi with your thumb, then rotate the crank.....If all is well you will see fuel move in the line...If it goes back toward the tank the inlet needle is leaking....
If there is a leak anywhere in the case, under the cylinder, under the carb, in the crankcase joint, at the front crank seal, there will be no suction...There are no other possibilities...




The object is just to get the pump diaphragm, carb body, and inlet needle/seat wet with fuel mix. The surface tension of the fluids then help the diaphragm seal onto the carb body and to lubricate the inlet needle and seat, nothing is done on the metering side of the carb, just the pump side. Once this is done it will always work fine unless you run your carb dry and let it sit for a month or two.

Mine had the same problem when brand new. I pulled the cowl off and primed the engine the old-fashioned way....I squirted gas down the carb throat. It started. I later came to find out that the low-speed needle was too lean. (Thanks, Jody) I adjusted the needles and it is a great running engine.

loosen the four screws on the diaphragm cover on the carb.now pressurize the fuel tank until you see fuel coming out, under the diaphragm cover.while fuel is coming out tighten the four screws,now the carb is wet and will not siphon back into the tank.i bet it will start rite up

Pop off pressure has nothing to do with how a carb pulls fuel when choked.....The piston moving up creates a suction in the crankcase, which is what pulls the fuel through the fuel line...If the carb venturi is completely closed all that suction is acting on the fuel line...If there is a leak anywhere in the line or if the inlet needle is stuck closed there will be no fuel drawn....PERIOD....Take the cover off, the one with 4 screws....Gently push on the long end of the lever to un seat the needle...Put the gasket on the carb, then the diaphragm, then the cover...
Cover the venturi with your thumb, then rotate the crank.....If all is well you will see fuel move in the line...If it goes back toward the tank the inlet needle is leaking....
If there is a leak anywhere in the case, under the cylinder, under the carb, in the crankcase joint, at the front crank seal, there will be no suction...There are no other possibilities...
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« Last Edit: Sep 24th, 2015 at 8:14pm by waverider »  

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Show the link to this post Re: Starting a recalcitrant new DLE
Reply #1 - Sep 24th, 2015 at 8:14pm
 
Well Mike; tried the pressure trick on the new DLE55 carb I put on the 53, with a difference. Instead of pressurizing the tank, i pulled the line off the carb and hooked the fuel pump directly to it....loosened the screws, turned the crank, and voila (that's French for bout time something worked right) there was fuel coming under the edge. Not a gusher, but the gasket was turning wet.

Hooked the tank back up, 4 flips on choke and "bark". Usual 7 on choke open and engine running!!!
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Show the link to this post Re: Starting a recalcitrant new DLE
Reply #2 - Sep 24th, 2015 at 8:48pm
 
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