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Fuel systems Q&A Carbs, injection, tanks, lines, pumps, everything fuel system related!

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Old 10-01-2018, 05:03 PM
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05snopro440 05snopro440 is offline
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Last edited by 05snopro440; 10-02-2018 at 07:48 AM.
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Old 10-01-2018, 08:16 PM
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Have you tried turning the sensitivity screw on the front of the vacuum pot to see if it may be bottomed out?
This screw will cause the secondaries to open sooner or later in the rpm range.
Clockwise will open later counter clockwise will open sooner.

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Old 10-01-2018, 09:06 PM
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Did you use the paper clip on a road test? (Your secondaries won't open on the driveway.)

Try this...

Ignition off, choke fully open, throttle wide open... open the secondaries manually... the diaphragm should hiss air thru the passage you blew your shop air past... let the diaphragm return... if it slams shut, you have a leak... if it closes slowly, it's good.

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Old 10-02-2018, 07:55 AM
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05snopro440 05snopro440 is offline
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Quote:
Originally Posted by Old Iron View Post
Have you tried turning the sensitivity screw on the front of the vacuum pot to see if it may be bottomed out?
This screw will cause the secondaries to open sooner or later in the rpm range.
Clockwise will open later counter clockwise will open sooner.

Mine doesn't have that adjustment.

Quote:
Originally Posted by Dr Crankenstein View Post
Did you use the paper clip on a road test? (Your secondaries won't open on the driveway.)

Try this...

Ignition off, choke fully open, throttle wide open... open the secondaries manually... the diaphragm should hiss air thru the passage you blew your shop air past... let the diaphragm return... if it slams shut, you have a leak... if it closes slowly, it's good.

.
Yep doc, always a road test for vac secondaries. I've tried that test but I'll try it again.

Thanks guys, I really appreciate the help. I discovered an issue with my throttle linkage that's causing it not to open the carb fully currently, so I'll be correcting that. I'm thinking that's the source of the issue. Admin can delete this one and I'll make a new thread if I still have a problem.
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My 455 Buick powered '46 GMC Build Thread

My '46 GMC on Photobucket
---------------------------------------------------------------
When you don't know what you're doing, it's best to do it quickly.

And when Iím gone, you can call me foolish but hopefully not boring. I will have lived.

The more I learn about women, the more I like my car.
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