fuel pressure question?

02ATIstang · May 21st, 2007, 03:48 PM

I have a procharged 02 gt and i have done the 2003 cobra pumps and tank swap. i have noticed that the fuel pressure drops to about 10psi around 5200rpms and it really seems slugish. Is that enough fuel pressure? i dont know if it has any thing to do with it but Also my check engine light is on DTCs codes are P0102 and P0113.

ChrisJ · May 21st, 2007, 03:59 PM

Did you upgrade the wiring and such when you did the cobra tanks?

Did you upgrade the fpdm (fuel pump driver module)?

MustangMatt96GT · May 21st, 2007, 04:01 PM

That is not near enough pressure! When you swaped the tanks did you do anyother modifications? Because to do this correctly you have to do some wiring modifications!

02ATIstang · May 22nd, 2007, 12:50 PM

no i didnt do any wiring mods i just put the tank in and the pumps. what do i need to do it the wiring??

MustangMatt96GT · May 22nd, 2007, 12:54 PM

http://www.moddedmustangs.com/2003-2...p.html#more-25

Read that I dont know if it says or not! I am to lazy to read the whole thing lol but I am sure that Chris will tell you for sure what you need to do! All that I know is that you need some othere mods, but not sure how or what! Srry man!

02ATIstang · May 22nd, 2007, 02:52 PM

That link is the same instructions i used to do the tank and pumps swap and it dont say any thang about changing any wiring.

02ATIstang · May 22nd, 2007, 04:07 PM

Who is Chris?

ChrisJ · May 22nd, 2007, 05:54 PM

Im Chris...

Click Here

Try what I said in that thread and see if it fixes it...The tanks are not just plug and play...There are some wiring issues that have to be addressed...

MustangMatt96GT · May 22nd, 2007, 06:01 PM

Yeah I couldnt remember what its called, but it is FPDM!

02ATIstang · May 23rd, 2007, 09:37 AM

ok thanks guys. One more Question where could I get a fpdm ? thanks agine

ChrisJ · May 23rd, 2007, 09:45 AM

The thin wire with all the amperage draw on em with actually cause resistance, and cause more draw, thus making the ECM think its at the limit of the pumps, when all it really is at, is the limit of the wire. Running (2) 10 gauge wires from the FPDM down to the tank will gain you about 10 percent duty cycle. Also running a dedicated 12V source from the battery powered via a relay will gain you another 10 percent.

Rewire the FPDM, and run a dedicated 12V source to the back of the car and have that feed the FPDM with a clean source of power, since its a 8 gauge power wire. What this does is lower resistance, amp draw, and makes sure the pumps are telling the ECM the exact duty cycle they are running at.

Most of the cars out there with no upgrades hitting 100 percent pump duty cycle are doing it falsely. Theres room left in the pumps but the resistance tells the ECM different, thus it can command them to run any harder.

02ATIstang · May 23rd, 2007, 11:51 AM

Thanks that helps out alot chris and it makes sence. I have talked to a few other people and mechenics. you sound like you know a hell of a lot more than they do. however they did say that i could add a boost-a-pump By KB and that sould solve my problem. In your opinion would that work your are they just blowing smoke up my ass?
thanks agine chris you really made it make sence of what i should do and why.

May 21st, 2007, 03:48 PM	#1
02ATIstang Newbie Join Date: Apr 2007 Posts: 27 iTrader: 0 reviews	fuel pressure question? I have a procharged 02 gt and i have done the 2003 cobra pumps and tank swap. i have noticed that the fuel pressure drops to about 10psi around 5200rpms and it really seems slugish. Is that enough fuel pressure? i dont know if it has any thing to do with it but Also my check engine light is on DTCs codes are P0102 and P0113.

May 21st, 2007, 03:59 PM	#2
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 38,220 Blog Entries: 4 iTrader: 10 reviews	Did you upgrade the wiring and such when you did the cobra tanks? Did you upgrade the fpdm (fuel pump driver module)? __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

May 21st, 2007, 04:01 PM	#3
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,690 iTrader: 3 reviews	That is not near enough pressure! When you swaped the tanks did you do anyother modifications? Because to do this correctly you have to do some wiring modifications! __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

May 22nd, 2007, 12:54 PM	#5
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,690 iTrader: 3 reviews	http://www.moddedmustangs.com/2003-2...p.html#more-25 Read that I dont know if it says or not! I am to lazy to read the whole thing lol but I am sure that Chris will tell you for sure what you need to do! All that I know is that you need some othere mods, but not sure how or what! Srry man! __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

May 22nd, 2007, 05:54 PM	#8
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 38,220 Blog Entries: 4 iTrader: 10 reviews	Im Chris... Click Here Try what I said in that thread and see if it fixes it...The tanks are not just plug and play...There are some wiring issues that have to be addressed... __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

May 22nd, 2007, 12:50 PM	#4
02ATIstang Newbie Join Date: Apr 2007 Posts: 27 iTrader: 0 reviews	no i didnt do any wiring mods i just put the tank in and the pumps. what do i need to do it the wiring??

May 22nd, 2007, 02:52 PM	#6
02ATIstang Newbie Join Date: Apr 2007 Posts: 27 iTrader: 0 reviews	That link is the same instructions i used to do the tank and pumps swap and it dont say any thang about changing any wiring.

May 22nd, 2007, 04:07 PM	#7
02ATIstang Newbie Join Date: Apr 2007 Posts: 27 iTrader: 0 reviews	Who is Chris?

May 22nd, 2007, 06:01 PM	#9
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,690 iTrader: 3 reviews	Yeah I couldnt remember what its called, but it is FPDM! __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

May 23rd, 2007, 09:37 AM	#10
02ATIstang Newbie Join Date: Apr 2007 Posts: 27 iTrader: 0 reviews	ok thanks guys. One more Question where could I get a fpdm ? thanks agine

May 23rd, 2007, 09:45 AM	#11
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 38,220 Blog Entries: 4 iTrader: 10 reviews	The thin wire with all the amperage draw on em with actually cause resistance, and cause more draw, thus making the ECM think its at the limit of the pumps, when all it really is at, is the limit of the wire. Running (2) 10 gauge wires from the FPDM down to the tank will gain you about 10 percent duty cycle. Also running a dedicated 12V source from the battery powered via a relay will gain you another 10 percent. Rewire the FPDM, and run a dedicated 12V source to the back of the car and have that feed the FPDM with a clean source of power, since its a 8 gauge power wire. What this does is lower resistance, amp draw, and makes sure the pumps are telling the ECM the exact duty cycle they are running at. Most of the cars out there with no upgrades hitting 100 percent pump duty cycle are doing it falsely. Theres room left in the pumps but the resistance tells the ECM different, thus it can command them to run any harder. __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

May 23rd, 2007, 11:51 AM	#12
02ATIstang Newbie Join Date: Apr 2007 Posts: 27 iTrader: 0 reviews	Thanks that helps out alot chris and it makes sence. I have talked to a few other people and mechenics. you sound like you know a hell of a lot more than they do. however they did say that i could add a boost-a-pump By KB and that sould solve my problem. In your opinion would that work your are they just blowing smoke up my ass? thanks agine chris you really made it make sence of what i should do and why.

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