Carb and Fuel Pump problems Onan CCKB

[powermax_paul 1]

That jet is definitely a problem. I've put a wrench in a needle nose vice grip to try to get at it and still don't know if I got the nut tight. I've replaced one fuel pump (on my 4041)with an electric one and plan to do the same with the others (on my 9020's) this summer. I tapped off the + side of the coil to run the pump. Paul

[JeffG 0]

5/16" open end wrench for the nut and a long skinny screwdriver for the needle (T). Takes a little practice, but you'll get good at it. I can do it with the engine shield in place and the tractor running! Granted it takes some finesse, and working from a couple different angles of attack. 1 1/2 - 1 3/4 turns out (from being seated) is a good starting point for the main jet. If you have any fuel pressure out of the pump, I'd say your probably all right. Not sure how much volume or pressure you should have. If you suspect the pump, most likely its just the diaphragm that needs replaced. Unfortunately, you have to purchase a complete fuel pump rebuild kit to get the diaphragm. Luckily, Kohler used the same fuel pump on some of their engines and you can purchase their kit for less than half of the cost of the Onan kit. Kohler part # 230675 (as opposed to Onan # 149-0582). The last time I bought one, it was around $12.00. Good luck. Jeff

[ARTC 0]

1) Is there a special tool for adjusting the main jet on a Zenith side draft carb? There is no room to get in there. 2) When checking the fuel pump ( top of engine mounted diaphram pump) turning the engine over by hand, how much fuel is supposed to come out? Some comes out but not alot, also fuel filter never fills. I'll take any help I can!

[Tuffy 1]

There is a special tool. It is shown in the service manual for the engine. Unfortunately I have not been able to find one. I would sure like one if you find a source. Without the special tool the best way to adjust is to remove the heat shield, air cleaner, and carb intake hose. Then get a small child (8 year old will do) with hands small enough to get in with a wrench and 90 degree driver to adust the main jet. Or buy a new carbruetor. Steve

[bimm 0]

I replaced the $130.00 fuel pump because it was leaking oil and gas. I also installed a clear filter. I noticed it does not fill the whole filter. I used a snap-on right angle needle hose pliers to adjust my new $270.00 onan carb. The bad part of story is $400.00 did not help it run any better. I replaced the coil for $40.00 and runs great. cost for good running powermax "priceless"

[JeffG 0]

'cost for good running powermax "priceless"' You've got that right! Jeff

[Sandy_Lake_Imp 2]

Don't waste time searching for the factory tool,had one,worked best to build frustration. Pitched it. The filter will fill only to where the fuel will pass thru. Install a clear return line to see what the system is doing. Bill

[Floydster 0]

Paul, Would like to know where you purchased the electric fuel pump for your tractor,and what kind. Thanks for the info. Checked the oil on one of my 620's yesterday and noticed gas in the oil, so I guess another fuel pump kit or a electric one. I'm getting kind of tired of putting pump kits in, lots of them over the years. Thanks again, Floyd