Topic: 1974 Sears 7hp fuel problems – Antique Outboard Motor Club,Inc

This topic has 11 replies, 4 voices, and was last updated 5 years, 8 months ago by Buccaneer.

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August 22, 2018 at 2:44 am #10929
john8504
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I have a 1974 Sears 7 hp that I’m having fuel delivery issues that I’m baffled by. I have taken carb completely apart and every passage is clear. I Cleaned it with carb cleaner and blown out with air compressor. It has the option for a remote tank but I disabled that by taking out the shut off for the onboard tank. It will get gas to the carb but the bowl might have a drop or two of fuel and nothing more. I can press the release on the remote tank connector and fuel will come out of there since the two fuel connections on the carb are linked. I’m rather baffled on why the bowl will not fill up with fuel. I have a second engine with same carb and it has the same problems. Anyone seen this before?

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August 22, 2018 at 2:56 am #81571
Buccaneer
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US Member
Sounds like the carb bowl is not venting. Gas can’t get in if air can’t get out.

Prepare to be boarded!
August 22, 2018 at 3:00 am #81573
john8504
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I can spray gas into mouth of carb and it will run. It has good spark and 92 compression.
August 22, 2018 at 5:20 am #81577
retiredoz
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US Member
Somewhere in the recesses of my memory chaos is a mention that when you reassemble that carb, make sure the ‘flat’ part of the bowl is directly under the inlet. I can’t tell by looking at your pics…
August 22, 2018 at 10:56 am #81582
john8504
Participant
So turn the bowl around to where the "shelf" is under the reeds?
August 22, 2018 at 12:08 pm #81584
Buccaneer
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US Member
Retiredoz, now that you mention it, I remember doing as you suggest,
so the float has room to "drop" and let fuel into the bowl.

quote retiredoz:

Somewhere in the recesses of my memory chaos is a mention that when you reassemble that carb, make sure the ‘flat’ part of the bowl is directly under the inlet. I can’t tell by looking at your pics…

Prepare to be boarded!
August 22, 2018 at 4:26 pm #81598
john8504
Participant
Makes sense. The simplest solutions are sometimes the hardest to see.
August 24, 2018 at 3:26 am #81679
john8504
Participant
Yup that was it. Rotated the bowl and now I have plenty of fuel and it came to life for the first time in many years. Free motor and no money spent on it so far!! Can’t beat that!
August 24, 2018 at 5:28 am #81680
retiredoz
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US Member
I have a really hard time figuring why that bowl is configured like that in the first place. You can add my name to people that tripped over it.
August 25, 2018 at 12:22 pm #81749
john8504
Participant
I have no idea. I’m sure the best mechanics have all done the same.
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