[BruceWilkie]

I highly reccomend a Permacool Filter/watertrap. IIRC its rated at over 90 GPM(not gph). I also prefer 2 3/8 hard lines over single # 8 or 10 from pump to regulator(s).

A quick check of inadequate supply (if you suspect a problem) is to put larger jets a few numbers higher in. If you have no change in performance(especially mph) you are not getting enough fuel. This is useful especially if you read the plugs and they appear even the slightest bit lean.

[Cliff R]

"Mallory does not reccomend a return line with the 140 pump. Been running one since 89 without a rtn line."

Scott, I've been running a Mallory Comp 140 pump since 2001.

We installed it "dead head", and it lasted about 2 months. On long cruises it would start to make a lot of noise, vibration, and fluctuate pressure when the brakes were applied, turns signals on, etc.

It died a miserable death and was so hot when I went back to check it, my hand nearly melted to it! We had it rebuilt under warrantee.

I installed a bypass system, and the same pump ran flawlessly until about a month ago when it gave up again. This time it only needed a new brush set, and was put back in service with a minor rebuild, no other problems anyplace.

I would not run one of those pumps in a daily driver in a "dead-head" set-up, even though Mallory says they can be set up that way.

They would be fine for a weekend warrior or full race car, as the pumps are well made and can tolerate the head pressure in short term use (obviously)....FWIW......Cliff

PS: I would add that after installing the bypass, the pump is nearly dead quiet, even after hours and hours of continuous use, where before it was considerably noisier, but not nearly as noisey as a similiar output vane type pump.

[tempest455]

The Aeromotive pumps also are regulated and bypass at the pump as well. You modulate the pressure at the pump so if you deadhead at the carb regulator for the set carb PSI, it will not put as much stress on the regulator. When I bought all the stuff for my fuel system, Behling Race Cars suggested this system. I installed this 10 years ago and never had a regulator problem.

[Skip Fix]

My first Mallory 140 run dead head lasted 10 years of street,autocross and drag miles. Bought a new one and had mallory rebuild the first one as a back up.Been in there 10 years but fewer miles.

[Ron H]

Last season I found the mallory 140 not keeping up once running 10.30's. It was fine when I was running 10.70's the season before. Swapped to a 250 and all is good.
I changed to a big holley regulator and -8 lines to the carb. Still have -8 from pump to regulator.

[Tom Vaught]

Mallory 140 would probably have been still ok if you had changed only to the Large (7/16" Ball) Holley Regulator. I think a lot of the issues posted were due to the previous regulator used even in OMT's case.

Tom Vaught

[wrench]

Just an "in case you didn't know", the original post in this thread is over 5 years old.

[Tom Vaught]

Actually it is New starting with Post #17.

Bringing up info that works is not necessarily a bad thing for newer members. I have posted several times the same info over the years.
It is that "Old Physics" deal. The basics do not change.

Tom Vaught

[Ron H]

Originally Posted by Tom Vaught

Mallory 140 would probably have been still ok if you had changed only to the Large (7/16" Ball) Holley Regulator. I think a lot of the issues posted were due to the previous regulator used even in OMT's case.

Tom Vaught

I guess that could be Tom. But with the intent of running mid to low nines, I figured why screw around with just the regulator and went with the pump as well.

[rompn63]

Just checked the Mallory site. They list a 140 pump with a 4309 (return) regulator.
Part #4142. I ran that set up for three years without any problems. When I stepped up the motor I added another 140 in tandem. I ran that set up for three more years untill my origional pump finally quit.

[Tom Vaught]

The Mallory Regulator Joe has been using (as well as a lot of the other Nostalgia SS Racers) is a good one. Mallory offers a retun style regulator, why not use one.

The Mallory 140 pump supposedly will put out 14 psi. With the AFB type carbs the NSS guys run (low fuel pressure required) the return regulator is a great idea. Course they have 4 needles and seats taking fuel, 8 barrels, and 4 fuel reservoirs for holding a lot of fuel going down the strip.

Tom Vaught

ps Jim Brady switched to a Mallory 140 and 7/16" Ball Holley Regulator and picked up 3 tenths. His 64 GTO would run in the 9s easily.

[cgeise]

Berry grant has a good section on there web site for "testing" flow on your set up - checki it out - If i remember - a ten sec car should pump a gallon in 15 seconds - better check it to make sure.

[Cliff R]

Last time I checked flow we filled a 6 gallon can in just under 2 minutes, something like a minute 50 seconds, nearly as I can remember. This is with a Mallory Comp 140 pump, bypass open (our bypass is before the regulator), and stock Holley regulator, 8AN lines/fittings everyplace. Guess that's about a gallon every 18 seconds. Fine so far with our new engine running low 11's with a q-jet and .145" fuel inlet seat.....Cliff

[Ron H]

FWIW I changed out the mallory regulator for the big holley.

[GTOGEORGE]

When it comes to fuel systems....................BIGGER is always better. This is coming from a lot of experience.


GTO George

[Cliff R]

Agreed. Always better to go with a fuel system good for low 10 second runs on an 11 second car, than the other way around! We still hear on occassion how the quadrajets fuel bowl is too small. Not so, it only has one needle/seat assembly, so a first rate fuel delivery system is required to keep in full on hard runs. Nothing exotic needed, but don't expect to run a Carter HP mechanical pump pulling thru stock lines and run mid-10's with one!......Cliff

[ta man]

I'm installing larger lines this year what are you guys using these days for fuel lines?

[taff2]

15mm copper tube as used in home plumbing,half the weight of braided hose and half the price of aluminum line.