Author Topic: Craftsman 3.7 won't pick up gas  (Read 1204 times)

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Offline pmeyers

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Craftsman 3.7 won't pick up gas
« on: October 22, 2021, 11:52:23 pm »
Have a 3.7/3800 . Original owner, it's in good shape, but haven't used it in a while. Trying to get it running again but can't get gas to the carb. I  cleaned the carb, Walbro HDB 8c. I put a kit in, new fuel line and filter. If I drip fuel into the carb it will fire up and die, and will not bring any fuel up the fuel line. It runs strong till the gas runs out.  Clearly missing something, any suggestions?   Pretty attached to the saw, would really like to get it running

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Offline Cut4fun

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Re: Craftsman 3.7 won't pick up gas
« Reply #1 on: October 23, 2021, 08:01:55 am »
Basics first,  sure you got diaphragms and gasket order right?  You wouldn't believe how many folks get them wrong.


This could do it too. Just joking on these but yes this came in like this.

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Offline Cut4fun

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Re: Craftsman 3.7 won't pick up gas
« Reply #2 on: October 23, 2021, 08:03:03 am »
HDB I just did on that same saw.

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Offline pmeyers

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Re: Craftsman 3.7 won't pick up gas
« Reply #3 on: October 23, 2021, 10:25:22 am »
Thanks Cut4fun, I'll lay the parts out in order and maybe you can catch something. Not 100% on the order since I took it to a shop a while back and they couldn't get it running. Not sure what they did but I didn't get it to run, just no gas. Been going by what diagrams I could find. The kit comes with a couple of different circular gaskets, using the one that matches what was in the saw. As a last resort any chance I could send you the carb and pay you to rebuild it  I can't solve it? Don't see how it could be anything else. Good compression, impulse passages are clear. I'm doing something wrong. 

Offline pmeyers

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Re: Craftsman 3.7 won't pick up gas
« Reply #4 on: October 23, 2021, 08:44:24 pm »
Cut4fun Here are a few pics with the gaskets. Maybe you can see something wrong? I set the lever even with the carb body. thanks

Offline Cut4fun .

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Re: Craftsman 3.7 won't pick up gas
« Reply #5 on: October 24, 2021, 07:02:28 am »
That dont help me see anything.

All I know is there is more then one gaskets and check valve dias offered in kits sometimes.  You have to make sure your matching up and using right one.

Some have extra holes some have missing holes. Either way then those dont work. Been there done that.
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Offline pmeyers

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Re: Craftsman 3.7 won't pick up gas
« Reply #6 on: October 24, 2021, 09:56:41 am »
Thanks for the looking. Guess my only option is to buy a functioning carb.

Offline Cut4fun .

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Re: Craftsman 3.7 won't pick up gas
« Reply #7 on: October 24, 2021, 10:22:20 am »
Thanks for the looking. Guess my only option is to buy a functioning carb.

Notice how many choices. Got to make sure using right ones.

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Offline pmeyers

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Re: Craftsman 3.7 won't pick up gas
« Reply #8 on: October 24, 2021, 08:02:36 pm »
Gone over the parts carefully and alignment with ports. Don't know how I would do it differently. Ordered an OEM kit just in case to replace the after market kit. So now I'm wondering about the fuel line. The line that goes to the carb seems simple enough, filter on the end in tank  and plugs directly onto carb. The second line I'm not certain about. There is a nipple and a short length of line that goes into the tank, and a longer length that attaches to the nipple goes through the hole in the tank and just lays down over the tank. Apparently this is a vent, but should it have a check valve so it only goes one way? Could my problem be in the tank and fuel lines. Some how not venting?

Offline pmeyers

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Re: Craftsman 3.7 won't pick up gas
« Reply #9 on: October 24, 2021, 08:16:43 pm »
Here's what the vent line looks like now

 

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