Starting Fluid - 520H Onan

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25 Jun 2018 14:44 #14699 by GoBucks
So, it cranks, but doesn't fire. If I add a little starting fluid it starts right up. This is only need for the first start of the week, if I cut it off, wash it off, etc, and get back on, it starts up fine.

Note, I was out of town for a month this time. I posted about the fuse holder, it's cranking now and just before I left at the end of May. Both times though, it didn't want to fire.

Any tips to lead me in the right direction?
Fuel filter?
Carb adjustment?
Fuel pump?

I replaced 1 spark plug before my trip. Yeah, only 1, short on time and the Previous Owner put in a full size car battery, so I can't easily get to the 2nd until I pull the battery.

Thank you,
Sam

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26 Jun 2018 08:18 #14700 by Geno
Replied by Geno on topic Starting Fluid - 520H Onan
Hey Sam. Have you tried taking the fuel line off at the filter and cranking it to see if the fuel pump is pumping?

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26 Jun 2018 11:13 #14701 by GoBucks
Replied by GoBucks on topic Starting Fluid - 520H Onan
Question, are there supposed to be 2 fuel filters on the 520H? Mine has one under the fuel tank and one by the fuel filter.

N0, I haven't tried it yet.

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26 Jun 2018 15:12 #14702 by Geno
Replied by Geno on topic Starting Fluid - 520H Onan
Should have only 1 fuel filter above the engine.

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01 Jul 2018 17:28 #14707 by GoBucks
Replied by GoBucks on topic Starting Fluid - 520H Onan
Saturday morning, I went out to cut the grass, it cranked but wouldn't start. I then removed the hose on the input side of the fuel filter, cranked a couple seconds and gas spurted out.

So, is there a carburetor adjustment I can make to fix the No start issue? It runs great once started, and will start up again no problem.

Thank you,
Sam

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01 Jul 2018 19:47 #14708 by GoBucks
Replied by GoBucks on topic Starting Fluid - 520H Onan
FYI: I did replace the spark plug wires this spring.

Looking into this, it sounds like the choke might be sticking or the needles in the carb are stuck?

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06 Jul 2018 10:32 #14713 by GoBucks
Replied by GoBucks on topic Starting Fluid - 520H Onan
I figured it out, the Choke wasn't closing all the way. I took the air cleaner off, pushed the choke down all the way, and it started right up. I hit it with some carb/choke cleaner last night, I'll do it again this morning on the outside of the carb and see how it does.

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14 Jan 2019 14:46 #15120 by GoBucks
Replied by GoBucks on topic Starting Fluid - 520H Onan
The problem is the choke doesn't close all the way.

How do I adjust it? I sprayed choke cleaner inside and out.

I disconnected the choke cable where it attaches to the carb. I then pushed the choke down all the way to close. I re-attached the cable. No luck, when I moved the choke cable up and down, the choke still wouldn't close all the way.

Thank you,
Sam

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14 Jan 2019 15:02 #15121 by Geno
Replied by Geno on topic Starting Fluid - 520H Onan
Does it seem like the choke is binding? Close the choke all the way with the adjustment loosened, then pull the choke lever up just a little (1/8") like you're choking it, then tighten the adjustment screw it should close fine. :thumb1

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28 Jan 2019 14:41 #15163 by GoBucks
Replied by GoBucks on topic Starting Fluid - 520H Onan
Should the choke close completely?

It doesn't bind, but doesn't want to close with the cable all the way. I adjusted it Saturday, then started it Ok Sunday, but it doesn't close completely. I also had in my mind your directions backwards. I choked it all the way, then loosened the nut, then pulled the choke down just a little, then pushed the choke closed with my finger, then tightened the nut.

https://lh3.googleusercontent.com/D7aglJEWTgknexHys4LljlrBkJ3rIu4YpoUb_3eETyGtqgFT5M7WFjZ5295lfGPcWSDzdnPBwhlfIwuISvXqgFhrg8yg3hH4Iz3y6D6FSm2Mye9ybYfO6iUsFVTXAmXeiIsIBJa_t1PplZkuxR-YTVoSJ9JZim2p0DtFjixYIh4Oi2AwY0sYBiT3HrBG9QSkgvOHTC0l-Th--Q0e7kDaiWUC3qDBhssDkNUj-LUoV_Biu7uPyUSQcp1B1IIiNwFSVm7WwOpTfeppje5_cCYDh-dWCMrtXMJONKSKcj_LXzZ06I5DPTc1iHohR0tR9Jtvyoe1bn3mvh-HaLFBv0mk7DrUVaZJc53XGQB_3vicHFQr7hk1qzSG_fL6AOwdPtljGWp4CEBGHuIbqnhwb8NC05TQOaOa4PgB_lda4VeE0KVE7etU4BAHEn7n_2ukLQJlkDRCpzn-_1WInQklUig2VOHiAAYvNgbuja0wq7-xbWB2lF-C5UTdnURBsh8bbnSyvxKL4RBkCkqk3I_wLIpMpDabPHo4eSoGdKtGsRorXeuv4iv_D-vZSPkjEGJ0-ISVy6ZKldoz52PYlrhXAOEzUR4pgADN5Vv1a-JFeo3e5l1UIbPxzXQ8wwh6hfWqB8thXEJ7BY9IeZqK7qvmawaKK6jiew=w1583-h890-no

520H choke

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