Fuel Pump And Regulator for Q-jet Carb - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 05-07-2019, 02:56 PM   #1 (permalink)
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Fuel Pump And Regulator for Q-jet Carb

I'm looking to install a Quadrajet on the 350 chevy motor in my 51 flat fender. What fuel pump should I use and do I need a pressure regulator to keep from overpowering the float/needle when I'm bouncing on the rocks? Should the fuel pressure regulator have a return to tank line? A long time ago I had a vacuum operated Cagle regulator on it and it ran good but I can't find one out there on the web. Also, is the Q-jet better on steep climbs? I used to have a 600 CFM Holley and it was a bitch getting it to work on high angles.
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Old 05-07-2019, 03:11 PM   #2 (permalink)
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Does the 350 Chevy have a provision for a mechanical fuel pump ?

I would use that over an electric pump, much more reliable fmpov.

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Old 05-07-2019, 05:02 PM   #3 (permalink)
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Run a factory mechanical pump from a 70’s-early 80’s Chevy. It will be internally regulated and have a return line.
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Old 05-07-2019, 05:52 PM   #4 (permalink)
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The mech pump is now blocked off. It had one on there when I bought the jeep in 89. Since I will feed from the tank drain thru the floor (tank under driver's seat) into a sump tank below the floor, it should be easy enough to draw from. I should have the clearance for the pump.
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Old 05-07-2019, 07:25 PM   #5 (permalink)
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That carburetor only wants 9-12 psi.


Just get a cheap electric pump, mount it near the tank.
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Old 05-07-2019, 07:38 PM   #6 (permalink)
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Yup. Either just buy a pump, plate, and rod and put a mech on it or a cheap pre-regulayed elce pump

Most carb only want 7psi but old school jeep guys install a hand opp, mech regulator and roll the psi real low when putting over obsticals
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Old 05-07-2019, 08:55 PM   #7 (permalink)
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The Q jet is the best carb for a 4x4. I ran one for years, it'll run pretty much at all angles except upside down when set up right. There's a reason it's called hillbilly fuel injection.
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Old 05-07-2019, 09:58 PM   #8 (permalink)
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I've used Carter and Holley electric fuel pumps on a quadrajet, it ran best with the factory cam driven pump. As for the return line I installed a 70s dodge style inline fuel filter they had a built in return line. Something like this https://images.app.goo.gl/6ynhrp6f5D17nkcj8 The part # I used is in the picture.
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Last edited by M92pv4u; 05-08-2019 at 08:05 AM.
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