hard starting jd 316

[jiminct]

my jd 316 w/ a onan is giving me a tough time starting i have good spark to the plugs. there is fuel in the fuel line at the clear filter near the carb. if i try to start it cranks and cranks but no start, even w/ the choke on. if i pull the air filter off and choke it off by hand it still cranks a bunch but it will start after awhile. once running it runs great. thinking i may have a dirty carb or possibly a bad diaphram fuel pump? when it runs you can see fuel going into the fuel filter but it just splashes in a bit at a time. any ideas where to dig into this a bit more. thanks.

 

[rex beavers]

I WOULD CHANGE THE GAS LINE THAT COME FROM GAS TANK TO FILTER . THE GAS EATS THE INSIDE OF THE LINE AN BLOCKS THE FLOW TRY TO GO TO A VINEL LINE THE GAS WOUNT HARM THE LINE

 

[joe csuti]

Disconnect line to carb from fuel pump,put end of line into a can/jar,crank eng,you should get a spurt of gas out of line on each revolution of eng if pump working,also check following,carb tight to manifold,manifold tight to block & gaskets good,if this eng has a split manifold(2pc)get eng started,let same warm up,run eng at idle,spray carb cleaner with plastic ext tube slowly around joint where manifold halves join,if eng speeds up/changes speed when doing this you have a leaking gasket at joint & eng sucking air,older mod onan eng are prone to this problem,if pump,manifold,gaskets ok,best guess is you have dirt/water in carb bowl,main jet & internal passages of carb body.

 

[El Toro]

We use to use that procedure on cars and trucks that had mechanical fuel pumps by placing our hand over the throat of the carburetor to see if the fuel pump was defective. You can actually keep it running using that procedure. Hal

 

[Phil in MI]

I have a 420 JD did the same thing. Took the intake manifold off, most of the rivets holding the two halves together were broken. The fix was drilling them out and bolting them together.

 

[S.Crum]

On my 316 with the Kohler engine, I found every year I had to take the fuel line off the carburator and give the carb a shot of compressed air to break the needle loose from the seat then everything is fine the rest of the season. Starts right up everytime. Seems the gas evaporates out of the bowl but the ethanol base keeps the needle glued in the seat. You know what they can do with that ethanol crap.

 

[Traditional Farmer]

I've fixed 2 of the 316 models that had cracks in the uptake line in the tank,they're brittle and crack with age will break off eventually