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63 305 V6 Bucking
#1413659 Sat Jun 12 2021 08:41 PM
Joined: Nov 2018
Posts: 3
O
Moderated
Hi, I have a 63 3/4 4x4 with the 305E that started bucking. I tuned up everything including new points, condenser, cap etc. Had the original Stromberg carb rebuilt and still having issues. I love that it's all original so don't want to do the holly carb thing.

Any feedback appreciated.

Thanks,
Rob


1963 gmc
Re: 63 305 V6 Bucking
Oldgmc1963 #1413678 Sat Jun 12 2021 10:09 PM
Joined: Mar 2010
Posts: 634
B
Curmudgeon
If you didn't check your fuel tank for rust (ethanol and old tanks = rust) and did not replace your fuel filter, the rebuilt carburetor could now have contaminants inside.

Check your fuel pump pressure or replace.

Check for vacuum leaks (carburetor to intake, vacuum lines/hoses, distributor timing advance diaphragm).

Replace coil.

Re: 63 305 V6 Bucking
buoymaker #1413682 Sat Jun 12 2021 10:40 PM
Joined: Nov 2018
Posts: 3
O
Moderated
thank you for the quick reply. Yes, did coil, plugs wires, cap, everything and fuel filter when the carb rebuilt. Fuel pump is about two years old but I probably haven't driven 300 miles. I'm no expert but when a pump goers it goes. I also left out that when I start it after she sits, runs perfect and then seems to happen 20 minutes into driving her.


1963 gmc
Re: 63 305 V6 Bucking
Oldgmc1963 #1413692 Sun Jun 13 2021 01:50 AM
Joined: Jun 2011
Posts: 4,234
E
'Bolter
Possible item in fuel tank?

Ed


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Re: 63 305 V6 Bucking
Oldgmc1963 #1413694 Sun Jun 13 2021 02:03 AM
Joined: Apr 2005
Posts: 10,099
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Crud in the fuel tank moving around occasionally covering the pickup.


Martin
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Re: 63 305 V6 Bucking
Oldgmc1963 #1413698 Sun Jun 13 2021 02:19 AM
Joined: Mar 2010
Posts: 634
B
Curmudgeon
It's not a procedure I would recommend without extra precaution to be safe....but....you could rig up a test fuel container and connect to the fuel pump.

The Stromberg WW has a good reputation.

Do you have a vented gas cap?

Re: 63 305 V6 Bucking
Oldgmc1963 #1413702 Sun Jun 13 2021 03:30 AM
Joined: Jul 2000
Posts: 1,317
G
Insomniac
Originally Posted by Oldgmc1963
I also left out that when I start it after she sits, runs perfect and then seems to happen 20 minutes into driving her.

Stuck heat riser?


Gord
----
1954 1/2 ton 235 4 speed
Re: 63 305 V6 Bucking
Oldgmc1963 #1413705 Sun Jun 13 2021 03:51 AM
Joined: Feb 2004
Posts: 23,018
H
'Bolter
Try rigging up a temporary fuel tank, like one for an outboard motor, and be sure it's well vented. Then take a test drive. I'm going to guess you're getting a vacuum in the tank after a few minutes of driving that's causing the engine to surge. You might have the wrong type of gas cap, or a clogged vent tube.
Jerry


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Re: 63 305 V6 Bucking
Oldgmc1963 #1413716 Sun Jun 13 2021 05:47 AM
Joined: May 2005
Posts: 8,366
B
Sir Searchalot
I will never ceased to be amazed at experienced Stovebolt folks firing off a bunch of ideas from just the word "bucking".


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Re: 63 305 V6 Bucking
Oldgmc1963 #1413722 Sun Jun 13 2021 01:19 PM
Joined: Nov 2018
Posts: 3
O
Moderated
Ditto. thank you all. Have some homework to do.


1963 gmc
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