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366 Chevy Don 3-7-05  
I have a 1990 Ward 54 passenger school bus with a 366 Chevy engine. It is equipped with a throttle body carburetor. My question - what is the fuel pressure going to the carburetor suppose to be?
Re: 366 Chevy Phil Feinstein 3-8-05  
Fuel pressure should be low for a carb; Something around 4 to 6 psi. Too much pressure and you'll push the needle off the seat and cause the carb to flood.

TBI or Throttle body Injection is fuel injection and fuel pressure runs anywhere from 35 to 45 psi.

With a 1990 model, I think you have either TBI or a feedback (electronic) carburator. If you don't see 2 fuel injectors on the top of it, it's a feedback carb and needs low pressure.

Hope that helps!
Re: 366 Chevy Tom Dangelo 3-20-05  
GM TBI preasure is 17 lbs. I have several of these systems set up on different vehicles. One is on an International 392 in my School BUs. I adapted everything from a 1989 Chevy 350 P/U with a TBI. You can get all of the iformation that you need for your system from

HTH. Yepabus sends
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