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By 62bigwindow - 9 Years Ago
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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?
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By miker - 9 Years Ago
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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.
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By 62bigwindow - 9 Years Ago
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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.
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By PF Arcand - 9 Years Ago
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Is it possible that dirt got into the float chamber? Does your fuel line have a fresh fuel filter?
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By 62bigwindow - 9 Years Ago
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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.
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By aussiebill - 9 Years Ago
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62bigwindow (4/13/2016)
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.
check power valve has correct gasket under it, and also it isnt flooding?
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By RB - 9 Years Ago
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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..
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By RB - 9 Years Ago
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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..
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By 62bigwindow - 9 Years Ago
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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.
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By Riz - 9 Years Ago
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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.
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By Riz - 9 Years Ago
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Forgot one other
The old style PV from vintage speed are about 1/32 shorter but those 2 threads are enough to bottom it out and leave a gap on the seal. You can mill out the bottom or order the shorter.
Vintage speed also has the PV plugs and bases with blocked idle circuits. I would recommend both as balancing all 3 are enough to make you cry.
It also adds the benefit of under less than 1/2 throttle you run only on the primary and get better gas mileage but have the outers functioning as dumpers when you put your foot in it. (It's slower to load up at tip in but much more street able at low throttle.
It limits some of the power available but way less tinkering once set up.
I want to say I got the spacers at Dashmans. Added some gaskacinch to the mounting surface on the manifold and carb bases. Cause once the weather gets warm 94s love to boil-
I actually put a restrictor plate in the heat riser(drilled a hole in some light sheet steel and slipped it in between the gasket and the manifold) to limit some of that.
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By 62bigwindow - 9 Years Ago
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I have the Vintage Speed set up that came with everything to make a 3x2. It included the primary and secondary rebuild kits with new bases and linkage. I bought it several years ago so I think I have the short pv you mentioned. I'll get some new ones. The manifold gasket I used has the restrictor for the exhaust crossover. I have a Holly pressure regulator and had it set at 2 psi. I'm hoping a good cleaning and new power valves will cure the problem. If not I may just sell the set up and use a single four barrel. I just don't have the free time to spend getting this set up.
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By 62bigwindow - 9 Years Ago
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Had the local guy go through my carbs and didn't really find much. I think know the pv on the primary is leaking. Floats are all fine as is the needle valve and seat. The pv plugs are leaking also so I think with all three leaking it is just dumping fuel in the engine. So bad that the plugs are wet from just cranking it over a few seconds. Looks like new pv and plugs are in order. Anyone have a size they recommend on the pv?
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By Richard - 9 Years Ago
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For whats it worth I bench test my carbs on the manifold or off. I use rubbing alcohol to do the testing. Much easier on the hands. I use a remote plastic tank with a hose and shut off. I know its not under pressure but it does test for leaks and if the float needle is working.
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By 62bigwindow - 9 Years Ago
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Sounds like good advice. I'm definitely going to do it this time. I don't want to have to take them back off.
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By 62bigwindow - 9 Years Ago
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Got it running finally. Had a strange combination of problems. The problem started when MSD sent me the wrong cap for the dizzy. So while we were cranking the engine trying to get it to fire the carbs were leaking and flooding the engine. That problem got the plugs really wet and after the cap was replaced they wouldn't fire. On top of that the used alternator conversion I bought wasn't charging. All the cranking put a strain on the battery and wasn't putting out its full potential. So I replaced the cap,went through the carbs with new pv plugs and a new pv,replaced the needle and seats with roto disc style from Charlie Price,set the floats per his recommendation and hooked up a battery charger and she fire off!
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By Riz - 9 Years Ago
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Awesome news, enjoy the three deuce.
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