Eddie I wonder if its because its dead heading at the regulator,if it was on a bypass I bet it might last longer?

I have had good luck with Mallory Comp 140 pumps on 700 hp engines. They have been dead headed and still last for years. Not too expensive and they come in a marine approved version.

PatriYacht I also ran a 140, motor plus NOS was 750hp,never had a prob



what about the holley black pump?

c.v products mechanical fuel pump absolutely rules. large inlet, interchangable pressure springs, internally bypassed, billet, degreeable.
for electric nothing beats the mallory. except for a weldon.
as mentioned everything else should be in accordance. and mostimportantly is a rutrn style regulator installed after the fuel rail.

Your 700 Hp Engine Will Require .98 Gpm Or 58.8 Gph
You Can Dead Head The Holley Blue,it Has A Built In Relief Valve. Caution Do Not Do This To Long The Pump Does Not Like This.

I was told that the engine requirment of fuel is related to rpm also.

I also use the CV Products mechanical pump. With the light "blue" spring you can run 750 HP safely at 5.5-6 lbs pressure @ WOT with no need for a regulator. At idle you have about 8-8.5 lbs. All accomplished with 3/8" lines...Dean don't start on my stock lines!

kids rule

i noticed the pump is mounted above the tank level, they are not disigned to suck only push . This will cause the pump to cavate generating heat, magnets will come unglued causing failure.