hi guys
i have a 2004 5.3L silverado 4x4.. it's got a returnless fuel system.with the fuel pump in the tank . my question is .. is the fuel pressure regulator in the tank too??. and is it possible to increase the pressure somehow ?????

and is it possible to increase the voltage to12.5 or 13 permanetly to the fuel pump to make it pump faster..( i know it will burn up the pump faster .just want to know if it's possible.and how it would be done ??) don't want to buy one of those expensive volt boosters. thanks

 

are you sure it's returnless?

 

yea....cuz im pretty sure they stopped using return in 01 or 02

 

yes it has a returnless fuel system ! they started using them in 04 for pollution problems. so the vapors won't get into in air. when it gets hot .

all the earlier years had return styles with fuel regulators on the fuel rail then going back into the tank

 

man, i learned something new. so they don't need all that charcoal canister crap anymore?

 

y?????

 

Yes, the regulator is part of the tank module(non-adjustable). Tank vents still connect to an EVAP system. Not returning heated fuel to the tank only reduces evaporative emissions.

A voltage booster will theoretically get you more pressure at the fuel rails by overwhelming the FPR. That is, the pump will push fuel faster than the FPR can spill the excess back into the tank. This might not be desirable at low RPMs. So a controller would be nice.