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Retired Wrencher

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Retired Wrencher

I have a k181 it was running 2 weeks ago. I took it off to tighten up the inlet valve that was leaking.  I think I have a bad  fuel pump I have tried every thing to get fuel to the carb. it sounds like it is working and it is on the cam. If any one has  info or a spare that I can buy or try so I can find out this problem. Thanks for your efforts.

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rmaynard

Have you tried turning the starter with the hose/line from the pump to the carburetor disconnected to see what kind of flow if any you have? If there is none, take the pump apart and see what the problem is. There are only 3 moving parts in the pump, the diaphragm, and two little spring-loaded discs that operate as one-way valves.  If debris gets lodged behind one of the discs, it keeps the fuel from pumping. If the diaphragm is torn, you will get no pumping. Aftermarket rebuild kits are available, I personally don't like the ones I've tried. I'd search eBay for a new or good used replacement.

Edited by rmaynard
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Gary L.

T1257

I have a Commando 8 with a K181 that also had a bad fuel pump and didn't like the new plastic ones they now have with snap in fittings so I installed an electric pump under the fuel tank mount.

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Retired Wrencher

Have you tried turning the starter with the hose/line from the pump to the carburetor disconnected to see what kind of flow if any you have? If there is none, take the pump apart and see what the problem is. There are only 3 moving parts in the pump, the diaphragm, and two little spring-loaded discs that operate as one-way valves.  If debris gets lodged behind one of the discs, it keeps the fuel from pumping. If the diaphragm is torn, you will get no pumping. Aftermarket rebuild kits are available, I personally don't like the ones I've tried. I'd search eBay for a new or good used replacement.

Yes Bob that's how I been testing  it. Nothing. A friend told me about taking off the pump and sticking the inlet side in some fuel and pump 20 time if no fuel it is bad. can u still rebuild these pumps.

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Retired Wrencher

T1257

I have a Commando 8 with a K181 that also had a bad fuel pump and didn't like the new plastic ones they now have with snap in fittings so I installed an electric pump under the fuel tank mount.

do u have the part # on that. I do not want to spend $100  for a new one if I can avoid it.

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Gary L.

T1257

I used a Mr. Gasket model #42s about  $ 40.00 on ebay. its low pressure I think about 1,5 - 4 psi.

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skrusins

If you want a rebuild kit for your fuel pump, this guy makes them and there really good.

http://then-now-auto.com/fuel-pumps/

 

Or like Gary L says get an electric

Edited by skrusins
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wmsue

Then and Now is a great company to deal with.

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Retired Wrencher

If you want a rebuild kit for your fuel pump, this guy makes them and there really good.

http://then-now-auto.com/fuel-pumps/

 

Or like Gary L says get an electric

Thanks SK/SINS this  looks like the way to go and in my back yard. Take Care.

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