Got my engine running in my wagon today. I am running an Edelbrock 573 with 3 Holley 94's. I'm having a problem getting the engine to run. The primary carb is dumping so much fuel into the engine that it won't hardly run. What could cause this? I was thinking that the floats are set too high causing the carb to flood the engine. I have a fuel pressure regulator and the gauge reads around 2 psi which is what I read to run them at. What do you guys think?

Durham Missouri

Been years, and others will be more knowledgable, but the new power valves look almost identical, screw in, and leak. Learned that the hard way. Float/needle/seat next suspect. After that, you need some who knows more than I remember.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

Thanks it gives me a start. The real kick in the pants is I had the set up done by someone who was supposed to be real good at this. There is a local who has about 60 year experience building carbs. I may drop them off to him to speed things up. The first car show here is May 7th and I still have to get the exhaust on and some road time on the car to dial it in.

Durham Missouri

Is it possible that dirt got into the float chamber?  Does your fuel line have a fresh fuel filter?


Paul

I guess anything is possible. Everything is new from the tank back with a filter in line and the fuel pump has a glass bowl with a filter. I looked a little closer last night and I think it's the front secondary car that's the culprit. The body to base gasket was completely soaked with gas. It's dumping in so much fuel that pushing on the throttle won't even speed the engine up and it sounds like it's only running on 4 cyl.

Durham Missouri

check power valve has correct gasket under it, and also it isnt flooding?


  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Those carbs are notorious for stuck needle valves . the bowl is filling up and dumping fuelright down the manifold.. A blown power valve would still allow it to run..

Pull the top off the carb.. You do not need to remove it from manifold.  Check the needle valve for dirt. Blow it out with compressed air and check to make sure the brass float is not leaking fuel to the inside.. Make sure the float arm did not get bent toward the cover when it was assembled.. Reassemble and it should be fine. This is a controversial subject, bit I block ff the end two power valves and jet up about 6-8 sizes.. Those carbs only work on wide open throttle anyway so the real function of a power valve (part throttle enrichment) never comes into play..It eliminates one variable  actually two since the outboard carbs both get blocked.. but not the primary..

Thanks for all the help. I removed the fuel lines from both secondary carbs and drained the fuel from them. It helped a little but still so rich it sounded like a sick 4 cyl. Pulled the tops off them and found some dirt and grit. Also took the first secondary carb apart and the power valve plug was wet so it's leaking also. I think I have an all of the above problem. Dirt here and there and leaking power valves. So off to the local expert they go. Big bummer as everything is new. Oh well.

Durham Missouri

I put an additional in line fuel filter after the fuel pump (Holley FE) and added a dial pressure regulator (the 94s are horrible greater than 2-3 psi and will flood.
Also what others said about the PV (Vintage Speed) has the correct ones as the new will bottom out. I want to say I went down to a 6" PV and did block the outers and up jet. The primary runs on 56 and the outers 62.
Also the bases were pretty rough-added phenolic spacers under all.
All running on a progressive I cobbled together. It runs a little lean under WOT with the PV but it keeps it decent at idle and moderate throttle.

It is going to take a ton of fidgeting, but there is a great sense of accomplishment when you get it straightened out. You might also get some carb cleaner and check for vacuum leaks as they are notorious at the bases.

Also the rubber needles are prone to degrading with ethanol fuel.

BTW I had hair when I started-that's gone now.

Mike Rizzo

1963 F100 "Rudy"

Daniel Island, SC