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I’m at the same crossroads with using the line with no restrictions but I’m wondering if the check valve in it is the only way the HPFP can build pressure on each stroke maybe?
we remove it on all our higher hp builds. if a car gets the LPE HPFP we use their check valve solely to prevent a very odd noise that happens without it.
we remove it on all our higher hp builds. if a car gets the LPE HPFP we use their check valve solely to prevent a very odd noise that happens without it.
Joe can you give me some more input on this issue?
Waiting on some part to come in from y’all and would like to do this if it helps out.
Thanks
Course I am running Holley Port injection but I dumped all that and ran dedicated secondary lines all the way up the car from a MagnaFuel 750 secondary pump. That line can support decent power but when you get to big numbers especially on ethanol imagine the fuel flow to support 30% more flow (just switching to E85) and 16 fuel injectors. Course common sense each application would require the flow that supports that build and fuel type. I wouldn't be guessing I would watch fuel pressure, injector flow rates, duty cycle (ensuring injectors aren't maxed), etc.
I went with a Fore 4 port regulator so I can combine both my stock hard-line and secondary lines upfront then send all my fuel through -10 AN line to that regulator. My previous Aeromotive regulator was restricting flow up top it was a -6an input. Moving to -10an and two -8an outputs now set's me up for flowing much more fuel and plenty of room to grow (I'm at 25lbs of boost now on my TSP 416 + F1A-94). Then I split two -8an lines one to feed my HPFP and one to feed my port rails. I also used a bypass billet block for my Flex Fuel Sensor b/c that sensor also restricts down to -6an the billet bypass block flows fuel around the flex fuel sensor maximizing fuel flow. Finally I have a return line back to my tank. I know that's overkill for most but I never want to run out of fuel, especially with the money invested in my build. That's the one thing I feel these DI motors (especially when adding port and E85) really needs, is a good flowing fuel system. Just my .02 I feel safer knowing it's overkill.
My engine bay looks awful I need to clean her up a bit but I posted some pics so others can see variations of how to do these low side fuel systems. I can post pics of the back where my fuel pump setup is and relays, etc. if need be.
Course I am running Holley Port injection but I dumped all that and ran dedicated secondary lines all the way up the car from a MagnaFuel 750 secondary pump. That line can support decent power but when you get to big numbers especially on ethanol imagine the fuel flow to support 30% more flow (just switching to E85) and 16 fuel injectors. Course common sense each application would require the flow that supports that build and fuel type. I wouldn't be guessing I would watch fuel pressure, injector flow rates, duty cycle (ensuring injectors aren't maxed), etc.
I went with a Fore 4 port regulator so I can combine both my stock hard-line and secondary lines upfront then send all my fuel through -10 AN line to that regulator. My previous Aeromotive regulator was restricting flow up top it was a -6an input. Moving to -10an and two -8an outputs now set's me up for flowing much more fuel and plenty of room to grow (I'm at 25lbs of boost now on my TSP 416 + F1A-94). Then I split two -8an lines one to feed my HPFP and one to feed my port rails. I also used a bypass billet block for my Flex Fuel Sensor b/c that sensor also restricts down to -6an the billet bypass block flows fuel around the flex fuel sensor maximizing fuel flow. Finally I have a return line back to my tank. I know that's overkill for most but I never want to run out of fuel, especially with the money invested in my build. That's the one thing I feel these DI motors (especially when adding port and E85) really needs, is a good flowing fuel system. Just my .02 I feel safer knowing it's overkill.
My engine bay looks awful I need to clean her up a bit but I posted some pics so others can see variations of how to do these low side fuel systems. I can post pics of the back where my fuel pump setup is and relays, etc. if need be.
It looks good it’s just race mode. That kind of boost you have no option other than aftermarket front to back on E80+ no question.
It looks good it’s just race mode. That kind of boost you have no option other than aftermarket front to back on E80+ no question.
Agreed. I started out smaller but found little bottlenecks as my build grew. It’s nice having lots of metrics to review. Both HP Tuners and Holley have tons of logs to consume. Not to say I haven’t had my share of problems lol.
I just had this problem, the check valve was bad. and the noises the car made was super odd, Pulsating HPFP back through the low pressure line along the whole tunnel of the car. RPM dependent of coarse.
07-27-2016, 03:39 PM
Fuel flow restriction Anyone change out this fuel line?
