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What fuel pressure - Qjet

Discussion in 'The Garage' started by mrk5, Jul 15, 2005.

  1. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    I just picked up an adjustable fuel pressure regulator so I could drop fuel pressure down to 1 or 2 on the trail.

    What should I set it at for street/highway driving? I'm thinking either 4 or 5.

    Oh, and I did search but almost all of the "fuel pressure" threads dealt with TBI.
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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  3. Mad-Dog

    Mad-Dog 1/2 ton status

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    5-7 psi is nominal fuel pressure, why on earth would you wanna drop fuel pressure to 1 or 2 psi on the trail....?

    I use a carbureted bypass regulator on a 7 psi mechanical pump to supply a constant 5 psi fuel pressure to the nitrous system and return any un-used fuel back to the tank, the carb gets a steady 7 psi fuel pressure.

    bypass regulators are nice because ant un-used is returned to the tank and not sitting stagnant in the line heating up.....cool fuel is good fuel.
     
  4. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    On angles it helps keep the needle from unseating on inclines due to fuel pressure since the angle will let the needle unseat easier than on level ground. Just one more way to avoid the expense of FI for a while longer.
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Scott , I run at 550 rpm in gear , and I don't stall . Your at a higher altitude , but I still expect the Q-jet to be allright with regular pressure numbers . They way the float and bowl are laid out is just much better , and the needle and seat are much more protected from slosh on these :D
     
  6. Mad-Dog

    Mad-Dog 1/2 ton status

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    Oh ok, i learn something new everyday here at CK5.......thanx
     
  7. R72K5

    R72K5 Banned

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    7 to 9 psi is stock mechanical carb pressure on Gm apps, like all of them really, v-8s, sixes, etc,
     
  8. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Come to think of it, the people that I've talked to about running the regulator were using Holleys. Maybe it helps a holley more than it would a qjet.
     
  9. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Maybe you can take it back ( regulator ) and buy another cool little toy for the toy :D
     
  10. Thunder

    Thunder 3/4 ton status

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    You shouldn't need a regulator with a Q-jet as long as you are using the stock pump. As said in above post they dont have slosh problems like Holley and Edelbrock. When set up right. A Q-jet is the next best thing to FI for off road. Q-jet AKA Hillbilly FI.
     

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