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Yep, the one discharge jet is plugged. But that wouldn't cause dying approaching a light.
That's the way it goes. Trying to solve one problem, find other issues.....
Originally Posted by ALBUQ F-1
To check the power valve, with the top of the carb off, full the fuel bowl to about 3/4 depth, cover the bowl with a piece of cardboard, and let it sit overnight. (The cardboard is to reduce evaporation). If the gas is mostly gone in the morning, the PV is leaking.
After 8 hours the bowl went from over 3/4 to about 1/4.
Looking at pictures from my rebuild years ago, the power valve doesn't look that hot.
So long as the diaphraghm deal isn't dry rotted and the gasket is good it should work OK. They need to be fairly tight, there is a torque published somewhere.
Did the fuel show up in the chamber underneath the PV? (or on the workbench) Are you sure it didn't just evaporate? Was there a gasket on the PV?
Daytona Parts, http://www.daytonaparts.com/, has the correct PV's for 94's. (Be sure NOT to tell him it's a '55 or he'll assume you have a 2110, which use a slightly different PV). Stock PV is a #7.5, but most people prefer a 6.5, for better gas mileage. Be sure to get a gasket with it.
Do you know what jets are in the carb? The jets that should be in a 7RT are #51. Ford didn't always mark them, tho.
I pulled the jets and they are #51
On the Datona parts web site, they don't specifically mention the 7RT
I think this is the proper kit??:
MAKE: FORD TRUCK
YEARS: 34-57
MODEL: 239, 272 V8
TYPE: 2100-D, AA-1, "94" ETC 2BBL
NUMBER:
MANUF: HOLLEY
KIT #: 601
It comes with a power valve. The picture looks to show two.
As for the vacuum covered with duct tape. I got some vacuum caps and put that on. When I pulled the duct tape, I see that I put a rivet head in the hole to help with the seal.
I seem to be getting distracted with the carb, but it's all good stuff.
Well I'll be.
I went out to the garage knowing I saved the old rebuilt kit. I bought it from Napa in 2002 which is probably when I rebuilt the carb. Echlin 2-5612
It has two power valves in it. I don't know why I didn't replace it. But, that's good news. I will use one of those and clean up everything and put it back together.
Is either preferred? The one without the visible spring doesn't move when I press down on the top.
Holley calls the PV an "economizer", the other is the spark control valve for the 2110-type carbs. The radius on the PV may prevent it seating properly; test it just like the old one, with a gasket. Then put the throttle section onto the bowl section, with no gasket between them, and make sure the head of the PV isn't hitting on the cavity below it.
I will play with this more this evening.
I did a little last night but I want to try more stuff before reporting what I find.
Another question, how do I unblock the venturi tubes (Accelerater Pump discharge Nozzle) is what others call it.
It looks like I can by a new one for $10, but I would like to clear this one out if possible.
Spray with carb cleaner, run a strand of wire thru it.
If those got plugged it is almost certain all the jets need cleaning. Unscrew the brass tubes that are inside the venturi boosters and make sure they aren't plugged.
If it has not been done, I believe I would disassemble and soak that carburetor in cleaner and blow out all passages. Joe, I do believe you're really having fun.
If it has not been done, I believe I would disassemble and soak that carburetor in cleaner and blow out all passages. Joe, I do believe you're really having fun.
Actually I am.
I just can't admit that in public. People look at me funny as it is.
I appreciate everyone's patience with me and your very helpful suggestions.
Holley calls the PV an "economizer", the other is the spark control valve for the 2110-type carbs. The radius on the PV may prevent it seating properly; test it just like the old one, with a gasket. Then put the throttle section onto the bowl section, with no gasket between them, and make sure the head of the PV isn't hitting on the cavity below it.
Hey, I seem to be one constant brain fart. It makes me feel good when you smart folk miss something on occasion.
I put both power valves in and filled the carb with gas with the base removed and they both leaked. I might be doing something wrong though. Does the base provide an extra seal?
08-31-2016, 02:19 PM
is what others call it. 
