yes i am having the same problem. i hit ether start/stop switch and it cranks But will not start.
I pulled the fuel line from the tank and its dry but i had around 50 gals in the tank so i was above the 30gal fuel pick up level
I do suspect that the fuel pump on mine may be the 120volt version (NHE)
I use to be a generator repairman/electrician for a generator shop and mining company but my Onan experience was with diesel Onans.
6.5 NHE Onan service and operators manual no need to go to flea bay just burn your own copy to a CD
http://www.cumminsonan.com/www/pdf/manuals/940-0502.pdf
http://www.cumminsonan.com/www/pdf/manuals/940-0122.pdf
these Onans have a very low pressure fuel pump 2 to 3 psi max