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#1424678 Mon Sep 20 2021 01:07 PM
Joined: Jun 2021
Posts: 59
C
'Bolter
1947 Chevrolet 1.5ton - original 216 motor.

Hi - When I bought my truck a few months ago, the PO had removed the carb to rebuild it, so the truck was neither together nor running. I purchased a W1 rebuild kit from classic truck parts and put everything together. However, there didn't seem to be much direction outside of setting float height. Can anyone offer any other advice as to initial setup, as in # of turns out on idle screws, or any other "hey, you really want to make sure X is set to Y specification", etc? She'll fire off ether but doesn't want to run otherwise. I've verified valve tappet clearances, points gap and timing. It just doesn't seem to be getting go-juice.

I've had the head off to unstick valves and replace a broken rocker and several bent pushrods. Plugs and wires are new, but haven't replaced points and button yet because I have good spark. The original glass-top-globe mechanical fuel pump was shot so I replaced it with a new non-filtered model specified for this application (not a generic). At this time I'm running it off of a test bottle of fuel to the mechanical fuel pump (truck doesn't have a proper fuel tank yet), and am priming with an electric fuel pump, which I then pull out of the way when I see it's got fuel at the carb (with the hard line off the bowl).


What should I be doing differently?

Capt Oblivious #1424681 Mon Sep 20 2021 01:12 PM
Joined: Feb 2000
Posts: 4,566
J
'Bolter
Idle mixture screw is 1 1/2 turns from lightly seated, turn the idle speed stop screw enough that you can see the throttle lever move to the open position, 800 + rpm, and use the choke. As for the electric fuel pump, just keep it inline, 99% of them will let the mechanical pump draw fuel through them.

Capt Oblivious #1424684 Mon Sep 20 2021 01:35 PM
Joined: Jun 2021
Posts: 59
C
'Bolter
Thanks! I'll give that shot. I grabbed the only electric pump that FLAPS had on shelf - and it absolutely blows fuel - as in, 7gpm overpowers the float.

Capt Oblivious #1424728 Mon Sep 20 2021 08:28 PM
Joined: Nov 2002
Posts: 2,423
C
Carburetion specialist
Did you blow compressed air through the idle circuit when you rebuilt the carb?

About 75 percent are plugged, and have to be rodded out, if the vehicle has been sitting unstarted for some time.

Jon.


Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify
If you truly believe "one size fits all" try walking a mile in your spouse's shoes!
[image]http://www.thecarburetorshop.com/Avatar.jpg[/image]
Capt Oblivious #1424734 Mon Sep 20 2021 09:45 PM
Joined: Dec 2018
Posts: 1,985
F
'Bolter
Captain Oblivious You might just fill your float bowl with gasoline till you see it trickle down the carb bore,it should then run at idle for a little bit ,then connect your fuel system and adjust.

Capt Oblivious #1424755 Tue Sep 21 2021 12:45 AM
Joined: Jun 2021
Posts: 59
C
'Bolter
I set the idle mix at 1.5 turns out like Joe said, and made sure to prefill the bowl like fixite said, ( there has got to be an easier way than taking the top off -don't laugh😂) and it fired up and ran right away... until it ran the bowl out. So Ive still got some fuel delivery issues to sort out. I had the fhard fuel line fitting off at the bowl yesterday while cranking and I dunno... I guess I just expected to see a little more out if that mechanical fuel pump.

Capt Oblivious #1424770 Tue Sep 21 2021 02:57 AM
Joined: Nov 2002
Posts: 2,423
C
Carburetion specialist
For testing purposes, you fill the float bowl through the bowl vent (3/16 brass tube sticking up at an angle in the air horn). Use an eyedropper, or a ketchup or mustard squeeze bottle that has been emptied and cleaned.

Jon.


Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify
If you truly believe "one size fits all" try walking a mile in your spouse's shoes!
[image]http://www.thecarburetorshop.com/Avatar.jpg[/image]
Capt Oblivious #1424795 Tue Sep 21 2021 12:22 PM
Joined: Jun 2021
Posts: 59
C
'Bolter
Thanks Jon. That's what I figured but wasn't sure. I've been using a disposable water bottle with a hole poked in the cap.
.
Side note: anyone got the line on a between the rails fuel tank? I understand old mustang tanks work... but which years?

Capt Oblivious #1424832 Tue Sep 21 2021 06:38 PM
Joined: Nov 1995
Posts: 5,599
J
Unrepentant VW Lover
Skipper --You aren't skeered to sit in the cab with all your gas, are you??? smile


John

"If there are no dogs in Heaven, then when I die I want to go where they went."
Will Rogers

'49 Chevrolet 3804
'73 IH 1310 Dump
'14 Ford E-350 4x4 (Quigley)




Capt Oblivious #1424852 Tue Sep 21 2021 10:44 PM
Joined: Jun 2021
Posts: 59
C
'Bolter
@John - the 47s originally had underbed tanks anyway (so no filler hole in the cab), and this is a big bolt - so it had a saddle tank outside the frame rail.

And as much as I bathe in gas... naw I ain't skeered 🤣

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