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#1
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fuel pump in Kohler CV engine
I have a riding mower with a CV-12 engine. Sometimes it stops as if out
of gas. If I remove the gas cap and wait a moment, a stream of bubbles from the fuel line will bubble up through the fuel. Then it will start quickly and run fine. I don't see what could be getting pumped up with air except the fuel pump. It's two check valves and a diaphragm operated by a nylon lever. The outlet check valve is at the top, so I don't understand how the pump could accumulate air. Has anyone else run into this problem? |
#2
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fuel pump in Kohler CV engine
On 05/21/2014 09:45 PM, J Burns wrote:
I have a riding mower with a CV-12 engine. Sometimes it stops as if out of gas. If I remove the gas cap and wait a moment, a stream of bubbles from the fuel line will bubble up through the fuel. Then it will start quickly and run fine. I don't see what could be getting pumped up with air except the fuel pump. It's two check valves and a diaphragm operated by a nylon lever. The outlet check valve is at the top, so I don't understand how the pump could accumulate air. Has anyone else run into this problem? Maybe the vent on your gas cap is plugged? Maybe the fuel pump is going south? |
#3
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fuel pump in Kohler CV engine
On Thursday, May 22, 2014 4:41:27 AM UTC-4, Chuck Finley wrote:
On 05/21/2014 09:45 PM, J Burns wrote: I have a riding mower with a CV-12 engine. Sometimes it stops as if out of gas. If I remove the gas cap and wait a moment, a stream of bubbles from the fuel line will bubble up through the fuel. Then it will start quickly and run fine. I don't see what could be getting pumped up with air except the fuel pump. It's two check valves and a diaphragm operated by a nylon lever. The outlet check valve is at the top, so I don't understand how the pump could accumulate air. Has anyone else run into this problem? Maybe the vent on your gas cap is plugged? That would be my first suspicion too. He could try leaving the cap loose for awhile and see what happens. Maybe the fuel pump is going south? |
#4
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fuel pump in Kohler CV engine
On 5/22/14, 7:55 AM, trader_4 wrote:
On Thursday, May 22, 2014 4:41:27 AM UTC-4, Chuck Finley wrote: On 05/21/2014 09:45 PM, J Burns wrote: I have a riding mower with a CV-12 engine. Sometimes it stops as if out of gas. If I remove the gas cap and wait a moment, a stream of bubbles from the fuel line will bubble up through the fuel. Then it will start quickly and run fine. I don't see what could be getting pumped up with air except the fuel pump. It's two check valves and a diaphragm operated by a nylon lever. The outlet check valve is at the top, so I don't understand how the pump could accumulate air. Has anyone else run into this problem? Maybe the vent on your gas cap is plugged? That would be my first suspicion too. He could try leaving the cap loose for awhile and see what happens. Maybe the fuel pump is going south? Thanks, Trader and Chuck. I hesitated to remove the pump because it was grimy outside. WD-40 and degreaser fixed that. I found it clean inside. The valves work freely and the diaphragm looks fine. I'll go with the gas cap theory because I have no other ideas. I haven't figured out why this would cause cause air to accumulate under pressure in the pump. It must be under pressure if it comes out after I unscrew the tank cap. After it has sat a couple of says, it takes a lot of cranking to start, as if the tank had sucked the pump dry. There's a catch: I turn the fuel shutoff when I leave it parked. I squirted some contact cleaner into the vent hole in the cap. I'd love to take it apart. Maybe I can find instructions online. |
#5
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fuel pump in Kohler CV engine
On Thu, 22 May 2014 14:16:47 -0400, J Burns
wrote: Thanks, Trader and Chuck. I hesitated to remove the pump because it was grimy outside. WD-40 and degreaser fixed that. I found it clean inside. The valves work freely and the diaphragm looks fine. I'll go with the gas cap theory because I have no other ideas. I haven't figured out why this would cause cause air to accumulate under pressure in the pump. It must be under pressure if it comes out after I unscrew the tank cap. If the gas cap vent is clogged, it creates a vacuum in the fuel tank. Eventually stops the engine. Loosen the cap first. If it stays running for an extended period, then it is likely the gas cap. Test that and afterwards you can clean the vent with a paper clip or buy a new gas cap. IME -- I like Guns and Titties |
#6
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fuel pump in Kohler CV engine
On 5/22/14, 2:32 PM, Oren wrote:
On Thu, 22 May 2014 14:16:47 -0400, J Burns wrote: Thanks, Trader and Chuck. I hesitated to remove the pump because it was grimy outside. WD-40 and degreaser fixed that. I found it clean inside. The valves work freely and the diaphragm looks fine. I'll go with the gas cap theory because I have no other ideas. I haven't figured out why this would cause cause air to accumulate under pressure in the pump. It must be under pressure if it comes out after I unscrew the tank cap. If the gas cap vent is clogged, it creates a vacuum in the fuel tank. Eventually stops the engine. Loosen the cap first. If it stays running for an extended period, then it is likely the gas cap. Test that and afterwards you can clean the vent with a paper clip or buy a new gas cap. IME I blew into the vent. It's a plain open vent: no valves. I had a lot of trouble starting and couldn't keep it running. I found almost no fuel flow. When I suspected the fuel pump last fall, I found a good flow. This time, when I took the pump off and worked the lever, I got a good flow. Aha, no pressure! I should have thought of that last fall. The spring-actuated valves are like flexible washers. I'll bet they're supposed to be rigid. Must be the gas! I just can't get good gas these days. I shop around, but nobody around here sells the $4 stuff anymore, and they're not willing to special order it for me. What this town needs is an airport! The pump is on order. I'll look for some tubing to bypass the pump. The tank is higher than the carburetor. I guess Kohler included a pump in case I wanted to mow upside down. |
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