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wiscogus

Simplicity Powermax wont stay running

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wiscogus

I am helping a good friend with his Simplicity Powermax. The tractor will start and run, however it dies within a few seconds after starting. It will run longer with the choke pulled out slightly. Tractor has the 19.5hp Onan CCKA-MS engine. At one point in time an aftermarket electric fuel pump was added as they thought it wasn't getting enough fuel. 

We also recently replaced the Marvel carb with a NOS replacement but the tractor still runs the same. 

Where should go from here? Any help would be much appreciated. 

Thanks! 

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ShaunE

Does it run smoothly for the few seconds or rough.  I guess I'd start by looking into the fuel delivery system.  From tank all the way to the carb.  Tank, lines, filter, pump output.

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Alltractoredup

Same as mentioned above, as well as, check the pressure output of fuel.  It seems pressure should be around 3-4 psi.

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jlasater

If it has a feed/return system like on the later 9020's, disconnect the return line and run the electric pump and see if you get fuel coming out. If it is similar, I have seen the suction and return lines swapped which means it will just pull air.

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