Seems to me that the in tank pump supplys the flow or volume of fuel to the cam driven pump and then the CDFP is responsible for raising the pressure for the direct injection, right???
If this is true then why do i keep hearing that its the CDFP that needs to be replaced to eliminate the fuel delivery problems that everyone is experiencing?? wouldnt it make more sense to upgrade the in tank pump rather than the CDFP to increase fuel flow/ volume to the CDFP?? Makes perfect sense to me.
there is one guy on here ( the only one ) that has actually replaced the intank pump rather than the CDFP and he claims that his sputtering problem has completely dissapeard unlike the few people that have replaced the CDFP instead.
For instance on my wrx i hit a brick wall at around 230whp until i upgraded my intank pump to the walbro 255lph then i was able to hit 275whp with my VF34 turbo. It would make perfect sense that replacing the intank pump would do you more justice than replacing the CDFP. the CDFP is basically there to step up fuel pressure only for the direct injection and has nothing to do with flow or volume. Just somthing to think about, what do you guys think????
If this is true then why do i keep hearing that its the CDFP that needs to be replaced to eliminate the fuel delivery problems that everyone is experiencing?? wouldnt it make more sense to upgrade the in tank pump rather than the CDFP to increase fuel flow/ volume to the CDFP?? Makes perfect sense to me.
there is one guy on here ( the only one ) that has actually replaced the intank pump rather than the CDFP and he claims that his sputtering problem has completely dissapeard unlike the few people that have replaced the CDFP instead.
For instance on my wrx i hit a brick wall at around 230whp until i upgraded my intank pump to the walbro 255lph then i was able to hit 275whp with my VF34 turbo. It would make perfect sense that replacing the intank pump would do you more justice than replacing the CDFP. the CDFP is basically there to step up fuel pressure only for the direct injection and has nothing to do with flow or volume. Just somthing to think about, what do you guys think????