Before, the filter was gummed up something fierce, and the 7 idled extra perfectly but absolutely would not accelerate and would just die when i hit the pedal.
Now that I have replaced the filter, I'm having the opposite problem. She is smoking out the neighborhood when I start her, idleing like crap, and no matter what I do to the air/fuel screw there is no change.
On the bright side, whenever I press the gas pedal, she accelerates smooth. However, I let her decel too fast, she stalls out. The carb has been rebuilt, there is a new aftermarket fuel pump on there (rated at a psi that is too high), and a clear filter to make sure there isnt much gunk comin through. I am suspect of high fuel pressure...

 

What are your float bowl fuel levels like?

 

I set the floats to stock spec according to the fsm, however the levels are still high. Also, I do not have a purge valve, i just have the connections plugged, i dont think that would have that much of an effect though. I'm going to hook the dash pot back up to see if that helps the decel.

 

High fuel pressure. Get a regulator on that and you'll probably be fine...


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you already answered your own question.... but we're still missing some important info.

what type of carb are we dealing with here?

Depending on the carb pressure could be fine, but generally speaking any aftermarket pump will need a gauge and regulator unless being used on a Holley.

 

The base fuel pressure on a Nikki needs to be between 3 to 3.5 psi. Anything above that will cause flooding at idle.

 

I got a FPR from Autozone, but I think I got a bad one b/c when I hooked it up, absolutely no fuel came through. Imma find my recipt and try another one. The fuel pump on there is rated @ 5.5-9 psi which is way too high. One more thing, when looking at the coils from the driver's side, left is leading correct? I may have got those mixed up too

 

Don;t use one of those crappy dial FPR's from Autozone. Get yourself a Holley 1-4 PSI if you're on a budget or a Mallory 4309 if you can spend a little more.

You didn't tell us what kinda pump you have either, so you may need a bypass style regulator as only certain pumps have internal bypasses. Without this, you will always have pressure issues and decreased pump life.

 

I'm running the nikki, freshly rebuilt, slightly stripped (kept vac op secondaries and choke system). The rats nest has been removed, but no leaks at all.

 

Okay, today I started her up and let her run for a bit, blowing noxious fumes all over the neighborhood. Then I unplugged the fuel pump wire for a couple of minutes with no change on how she was runnin. Does this rule out fuel pressure as my issue?
Also, I wanted to say that I appreciate eveyone's input, this kind of help is hard to find. Many thanks. I have been working on this issue for about a month and I'm losing my mind...

 

Minutes? With no pump active?

 

Yes, I think it was about 2 minutes. So that pretty much rules it out then?

 

I'm surprised you could run that long out of the bowls. It would rule out under-delivery, yes, but not over pressure.