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Speed Density/Carb/SSP section This section is for the Speed Density or Carb vehicles, as well as Special Service Package 'Stangs

Running Rich Issues

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Old 03-27-2012, 08:45 PM   #1
3rd Gear Member
87Stallion's Avatar
Join Date: Dec 2007
Vehicle: 87 Mustang
Location: ALberta
Posts: 630
Default Running Rich Issues

My car is running really rich after a fuel system upgrade

Heres my setup
393 stroker big roller cam
Quickfuel Q750 carb

I added a sumped tank and -8 lines witsh return setup

Before fuel system change i was running 70 & 80 jets

After change it was running really rich fouling the plugs

Changed to 67 & 77 jets still runs rich

is it normal that i would need to jet that much lower?

Out of box settings are 74 & 84
87 Mustang
393 Stroker

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