For some reason I still don't have enough fuel. Running lean.
05-07-2013, 03:34 PM
#1
Thread Starter
Join Date: Nov 2011
Location: Canada N.B
Posts: 12
For some reason I still don't have enough fuel. Running lean.
I just installed the Ford racing dual fuel pump and harness because I was running lean with the stock pump,boost a pump and 47pound injectors. Now with the new gt500 fuel pump, my tuner is telling me im still running lean over 5500rpm's at 400rwhp. Kinda low since the gt500 is running 550hp stock with the same pump. Im running out of idea's here. What could possibly cause my car to lean with only 400rwhp? Anybody had this issue before? Please help. Thank you guys!!!!!!!!
2006 mustang gt automatic with the on3performence 70mm turbo kit, 4:10's, 47pnds injectors, gt500 dual fuel pumps, and lots of other suspension goodies.
2006 mustang gt automatic with the on3performence 70mm turbo kit, 4:10's, 47pnds injectors, gt500 dual fuel pumps, and lots of other suspension goodies.
05-08-2013, 08:25 AM
#5
6th Gear Member
Join Date: Jul 2008
Location: Acworth, GA
Posts: 12,260
05-08-2013, 10:21 AM
#6
Lean could be an air issue just as easily as a fuel issue. Check your maf and all your inlet piping/intercooling piping to make sure you arent sucking in un monitored air somewhere. Check fuel lines. Do you have A/F ratio gauge to see for yourself? How about a fuel pressure gauge to verify it isnt a line issue or somewhere else?
Just throwing out some ideas. Good luck.
05-08-2013, 02:24 PM
#7
2nd Gear Member
Join Date: Aug 2012
Location: Texas
Posts: 219
That or he is just having a problem elsewhere in the system. Who's tuning it? Maybe someone has some experience with them.
Lean could be an air issue just as easily as a fuel issue. Check your maf and all your inlet piping/intercooling piping to make sure you arent sucking in un monitored air somewhere. Check fuel lines. Do you have A/F ratio gauge to see for yourself? How about a fuel pressure gauge to verify it isnt a line issue or somewhere else?
Just throwing out some ideas. Good luck.
Lean could be an air issue just as easily as a fuel issue. Check your maf and all your inlet piping/intercooling piping to make sure you arent sucking in un monitored air somewhere. Check fuel lines. Do you have A/F ratio gauge to see for yourself? How about a fuel pressure gauge to verify it isnt a line issue or somewhere else?
Just throwing out some ideas. Good luck.
05-08-2013, 07:19 PM
#9
3rd Gear Member
Join Date: Jun 2010
Location: RI
Posts: 690
I once had a set of GT500 pumps where one of the two pumps all of a sudden went bad. The motor would run until the FPDM's would overheat and then it would lean out (AFR would start climbing 16, 17, 18) and the motor would die. Let it cool off and then it would run fine until the FPDM's got hot again. Nursed it home about 180 miles on I-95 that way.
That is why I asked the OP about fpdc numbers. With both pumps working he should be at 19-21% at idle. A bad pump will double those numbers.
That is why I asked the OP about fpdc numbers. With both pumps working he should be at 19-21% at idle. A bad pump will double those numbers.
Last edited by jpplaw; 05-08-2013 at 07:28 PM.
05-08-2013, 08:21 PM
#10
6th Gear Member
Join Date: Sep 2006
Location: Gainesville, FL
Posts: 11,278
I once had a set of GT500 pumps where one of the two pumps all of a sudden went bad. The motor would run until the FPDM's would overheat and then it would lean out (AFR would start climbing 16, 17, 18) and the motor would die. Let it cool off and then it would run fine until the FPDM's got hot again. Nursed it home about 180 miles on I-95 that way.
That is why I asked the OP about fpdc numbers. With both pumps working he should be at 19-21% at idle. A bad pump will double those numbers.
That is why I asked the OP about fpdc numbers. With both pumps working he should be at 19-21% at idle. A bad pump will double those numbers.