stock 84 240 i need a new intank pump question, i want slight better performance will the QFS 255LPH or something with higher LPH and psi work? the one im thinking about is 14- i think 48psi will it work with the main fuel pump? or to much pressure it

may it regulate with the regulator im not sure, also what is the stock intank pump pressure 28 psi?

 

"i want slight better performance" - not sure what that means - higher fuel pressure will not create "better performance". The extra fuel pressure will just be bled off back to the tank by the regulator. You will not produce more horsepower with higher fuel pressure.

When I've measured pressure from the in-tank pump it's been about 15 psi. (on cars with a main pump also under the car, there are some 940s that only have a pump in the tank)