General Category > Quadrajet Carb Talk and Tips

Quality, reliable mechanical fuel pumps

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Cadman-iac:

--- Quote from: quadrajam on June 20, 2025, 05:36:28 PM ---My truck is a 92 s10 that was originally a 4.3 v6 with TBI. Now has a near stock
carburated 355 v8. I used a parts store replacement in-tank for the 92 s10.
The regulator is a Holly 12-887 mounted on the AC evap box. The pump outputs
 about 12-15 psi and the regulator is set @ 6 1/2 lbs. Also ran new lines while I was at it.

I slid some insulation tubing over the lines under the hood and just behind the engine
although there wasn't any issues with heat, I just did it anyway.

I ran a fuel pressure gauge on the dash for years during the mechanical pump/crappy
gas fiasco. Now there is 6 psi all the time and I finally got rid of the gauge.

There may be better choices for the pump and regulator. Not my area of expertice
but I got lucky and it worked first time. Been about 3 months & 2500 miles, no problems.

QJ

--- End quote ---

 I'm ordering a regulator for it today, and gonna put the original pump back in the tank, since the wiring is all there, well mostly anyway.  Gotta reconnect the relay to the rear harness again, I rerouted it when I relocated the electric pump to the frame rail.


 Let me ask you, what kind of insulation did you use on your fuel lines? How thick was it, and is it split so you can slide it over the lines, or do you have to pull the lines loose from the frame to slide it down the line, and do you think you really got much benefit from it?

 Another question, why did you run new fuel lines?  Did you increase the diameter, or route it somewhere else to avoid getting too close to the exhaust or something?
 
 I'm hoping  by going back to the in-tank pump and installing a regulator that I'll finally stop this heat problem.
  I only want to do this once because my hands and knees can't handle much more of it this.  I am trying to avoid surgery on both.  Getting old sucks!!

 Rick

quadrajam:
The insulation I found at SUMMIT. THERMA SHIELD Techflex. Silver foil over white woven fiberglass.
Comes in 4 ft lengths. Split or not split.I used 3/4 and some 1/2 inch. Used it in the engine compartment and down over where it crosses trans bell housing. Used no insulation beyond that.
I prefer it over the DEI 3 ft. short high$ stuff at the parts store.
  I ran new lines mostly because the original metal lines toward the front were gone.  Fuel injection
grade rubber lines 3/8 supply from pump output to regulator, 1/4 inch new line from the regulator
 to a return line fitting plumbed into the top of the fuel pump. The 5/16 inch original return line
is now an emergency get me home fuel supply using a holly mighty mite inline pump. Should
the in tank pump fail I can swap one wire and one hose under the hood and be on my way.

I get the part about knees back and aches & pains. I don't own a lift, just a set of ramps and a
couple of jacks.

quadrajam:
Also the insulation I used is not very thick at all. And you wont need it except maybe under the hood
and near exhaust parts. Lines on the frame rail shouldnt be much of a problem.

The circulation of fuel and the fact that its no longer under a vacuum accounts for much of
the magic that goes with in tank systems.

QJ

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