Fuel system advice

Doggins · July 23rd, 2011, 06:15 PM

Hey,

Just had some questions on the fuel system on the 97gt. My current fuel pump is going out (fuel pressure gauge shows fuel losing pressure when the car is off and it takes a few cycles of the key to charge it up to the correct pressure as well). I just purchased a Holley 255 LPH fuel pump and will install it next weekend.

I'm wondering with my current mods if/how I need to upgrade the injectors/MAF/fuel regulator, etc. My mods are:

CAI/PP throttlebody/accufab plenum/ P.I. intake/ ported and polished P.I. heads/ reground P.I. cams/Steeda UDP/BBK shorty headers (have a set up pypes LTs i havnt put on yet/

my injectors/MAF/FPR are all stock and I think i'm running a bit lean. I had the car tuned by houston performance so it has a diablochip in it but they were terrible and couldn't get the car to run with out detonating until they pulled a bunch of timing.Just wondering what you all think. Thanks

Doggins · July 28th, 2011, 01:08 PM

Any fuel system experts out there?

Speedstang302 · July 28th, 2011, 10:01 PM

I'd say your still under the power limits for 19lb injectors... But your stock maf maybe shot...I'd say just 24lb it and lightning maf and you'll be set for a while.

Doggins · July 28th, 2011, 10:03 PM

so if i grab the lightning maf and some 24lb injectors, how do i calibrate? Using an SCT tuner? or do i need to go get a dyno tune for the new equipment

Speedstang302 · July 28th, 2011, 10:45 PM

You can call up a local shop that has a licensing with sct and can email you a tune to put into your hand held tuner for usually about $30ea. But I'm pretty sure your tuner has maf and injector selections. I've only used sf3 and xcal3 and those do idk any others

4.6 GT 143 · July 31st, 2011, 02:05 AM

normally if you are losing pressure with key off the pressure regulator is going bad... pull the vacuum line off and see if its wet or has a heave smell of gas

July 23rd, 2011, 06:15 PM	#1
Doggins Regular Join Date: May 2008 Location: Pensacola, FL Posts: 52 iTrader: 1 reviews	Fuel system advice Hey, Just had some questions on the fuel system on the 97gt. My current fuel pump is going out (fuel pressure gauge shows fuel losing pressure when the car is off and it takes a few cycles of the key to charge it up to the correct pressure as well). I just purchased a Holley 255 LPH fuel pump and will install it next weekend. I'm wondering with my current mods if/how I need to upgrade the injectors/MAF/fuel regulator, etc. My mods are: CAI/PP throttlebody/accufab plenum/ P.I. intake/ ported and polished P.I. heads/ reground P.I. cams/Steeda UDP/BBK shorty headers (have a set up pypes LTs i havnt put on yet/ my injectors/MAF/FPR are all stock and I think i'm running a bit lean. I had the car tuned by houston performance so it has a diablochip in it but they were terrible and couldn't get the car to run with out detonating until they pulled a bunch of timing.Just wondering what you all think. Thanks

July 28th, 2011, 10:01 PM	#3
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,830 iTrader: 1 reviews	I'd say your still under the power limits for 19lb injectors... But your stock maf maybe shot...I'd say just 24lb it and lightning maf and you'll be set for a while. __________________ 1990 GT- GT40p Heads\| Anderson N41 cam\| Crane 1.6 RR's\| Trickflow Intake\|MGW Short Throw\| Aluminum d/s\| 3.73's.....still slow....

July 28th, 2011, 10:45 PM	#5
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,830 iTrader: 1 reviews	You can call up a local shop that has a licensing with sct and can email you a tune to put into your hand held tuner for usually about $30ea. But I'm pretty sure your tuner has maf and injector selections. I've only used sf3 and xcal3 and those do idk any others __________________ 1990 GT- GT40p Heads\| Anderson N41 cam\| Crane 1.6 RR's\| Trickflow Intake\|MGW Short Throw\| Aluminum d/s\| 3.73's.....still slow....

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July 28th, 2011, 01:08 PM	#2
Doggins Regular Join Date: May 2008 Location: Pensacola, FL Posts: 52 iTrader: 1 reviews	Any fuel system experts out there?

July 28th, 2011, 10:03 PM	#4
Doggins Regular Join Date: May 2008 Location: Pensacola, FL Posts: 52 iTrader: 1 reviews	so if i grab the lightning maf and some 24lb injectors, how do i calibrate? Using an SCT tuner? or do i need to go get a dyno tune for the new equipment

July 31st, 2011, 02:05 AM	#6
4.6 GT 143 Newbie 98 GT 13.6 Join Date: Jul 2011 Location: Ohio Posts: 8 iTrader: 0 reviews	normally if you are losing pressure with key off the pressure regulator is going bad... pull the vacuum line off and see if its wet or has a heave smell of gas

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