Search



Go Back   MustangForums.com > Ford Mustang Tech > 2005 - 2014 Mustangs
Sign in using an external account
Register Forgot Password?
Search

2005 - 2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.
Sponsored by Latemodel Restoration


Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 05-07-2013, 03:34 PM   #1
ToxicReaper7

 
Join Date: Nov 2011
Vehicle: 2006 Ford Mustang GT
Location: Canada N.B
Posts: 12
Default 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.
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
ToxicReaper7 is offline   Reply With Quote
Old 05-07-2013, 04:08 PM   #2
2005Redfire6
6th Gear Member

 
Join Date: Jul 2008
Vehicle: 2005 Mustang
Location: Acworth, GA
Posts: 12,123
Default

You sure your tuner knows what hes doing?
__________________
Eddie
Livernois 298 stroker
2005Redfire6 is offline   Reply With Quote
Old 05-07-2013, 07:32 PM   #3
jpplaw
3rd Gear Member
 
jpplaw's Avatar
 
Join Date: Jun 2010
Vehicle: 2009 Ford Mustang GT
Location: RI
Posts: 516
Default

What are the fpdc (fuel pump duty cycle) numbers showing? Good GT500 pumps should not be going lean at that low power level.
__________________
2009 GT Coupe - Daily Driver
Brenspeed B326
FRPP Stage 1 ported heads
E-Force /2.75” Pulley - IW 18% OD Balancer
ID 725 Injectors
Comp Cams 127450's
GT500 Dual Fuel Pumps w/ dual VMP boosters
Fluidyne Aluminum Radiator
AFCO Heat Exchanger w/ fans
Dad's Intercooler tank
Kooks 1 5/8” Headers, Green Cats, H-pipe
PI 3200 rpm Converter
3.73 Gears
Dynotech Aluminum Driveshaft
Strange Adj. Struts and Shocks
GT500 Brembo Brakes & BAER 14” Rotors

DYNOJET: 633 rwhp/623 rwtq (4/2/14)

jpplaw is offline   Reply With Quote
Old 05-07-2013, 09:10 PM   #4
SpartaPerformance
4th Gear Member

 
SpartaPerformance's Avatar
 
Join Date: Apr 2010
Vehicle: 2007 Ford Mustang GT
Location: Long Island, New York
Posts: 1,270
Default

Stock fuel system is good for 450BHP, there is NO WAY GT500 pumps and 47lb injectors are not enough for 400RWHP. Go elsewhere.
SpartaPerformance is offline   Reply With Quote
Old 05-08-2013, 08:25 AM   #5
2005Redfire6
6th Gear Member

 
Join Date: Jul 2008
Vehicle: 2005 Mustang
Location: Acworth, GA
Posts: 12,123
Default

Quote:
Originally Posted by SpartaPerformance View Post
Stock fuel system is good for 450BHP, there is NO WAY GT500 pumps and 47lb injectors are not enough for 400RWHP. Go elsewhere.
+1, I think the issue may be with the person tuning the car itself.
__________________
Eddie
Livernois 298 stroker
2005Redfire6 is offline   Reply With Quote
Old 05-08-2013, 10:21 AM   #6
TheStigSC
2nd Gear Member
 
TheStigSC's Avatar
 
Join Date: Jan 2013
Vehicle: 2006 Ford Mustang
Location: Maryland
Posts: 287
Seth Laidacker ReverendStang Philly2Pixburgh
Default

Quote:
Originally Posted by 2005Redfire6 View Post
+1, I think the issue may be with the person tuning the car itself.
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.
__________________
2014 Candy Blue Ford Focus Titanium

2006 Vista Blue Ford Mustang GT SOLD!
-Kenne Bell 2.6l Intercooled Supercharger
-Lowered on Ford Racing Suspension (Shocks, Springs, Front and Rear Anti-Roll Bars)
-Roush Lower Control Arms
-Ford Racing Headers and Full Exhaust
-Hurst Short Shifter

Check out my photography!

Seth Laidacker Photography
Hi-Res
YouTube Channel
TheStigSC is offline   Reply With Quote
Old 05-08-2013, 02:24 PM   #7
awbreyjd
2nd Gear Member

 
Join Date: Aug 2012
Vehicle: 2013 Ford Mustang 5.0
Location: Texas
Posts: 219
Default

Quote:
Originally Posted by TheStigSC View Post
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.
This is the best advice. But if nothing is apparent after checking these items, its prolly the person tuning.
__________________
2013 5.0
Lethal Performance O/R xpipe and duel pump fuel return style system, frpp 47lbs injectors, Vortech with 3.48 pulley, Boss heads/Cams, Aluminum Driveshaft, frpp 3.31 gears. pypes pypebomb cat back, mgw shifter. jlt intake, boss 302 intake manifold. bbk 85mm tb.
11.4@130 1/4 at a 3700 DA. (2.0 60ft)
721hp/525tq (tuned by Seminole Automotive Performance)
awbreyjd is offline   Reply With Quote
Old 05-08-2013, 07:06 PM   #8
moosestang
6th Gear Member
 
Join Date: Sep 2006
Vehicle: 2006 mustang gt
Location: Gainesville, FL
Posts: 11,253
Default

Be sure both pumps are running! You wouldn't be the first person to get a bad fuel pump wiring harness or fpdm.
__________________
Boost or Buell, decisions, decisions.

whipple HO SC,FRPP k springs, Pypes mid mufflers, hurst, frpp TB, 4.10's, spohn lca's, adj. UCA, relo brackets, 1 piece DS, spec stg 3+ clutch. 12.52@117.6mph so far with a 2.01 60 ft time

Pumpkin jacking addict
moosestang is offline   Reply With Quote
Old 05-08-2013, 07:19 PM   #9
jpplaw
3rd Gear Member
 
jpplaw's Avatar
 
Join Date: Jun 2010
Vehicle: 2009 Ford Mustang GT
Location: RI
Posts: 516
Default

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.
__________________
2009 GT Coupe - Daily Driver
Brenspeed B326
FRPP Stage 1 ported heads
E-Force /2.75” Pulley - IW 18% OD Balancer
ID 725 Injectors
Comp Cams 127450's
GT500 Dual Fuel Pumps w/ dual VMP boosters
Fluidyne Aluminum Radiator
AFCO Heat Exchanger w/ fans
Dad's Intercooler tank
Kooks 1 5/8” Headers, Green Cats, H-pipe
PI 3200 rpm Converter
3.73 Gears
Dynotech Aluminum Driveshaft
Strange Adj. Struts and Shocks
GT500 Brembo Brakes & BAER 14” Rotors

DYNOJET: 633 rwhp/623 rwtq (4/2/14)


Last edited by jpplaw; 05-08-2013 at 07:28 PM.
jpplaw is offline   Reply With Quote
Old 05-08-2013, 08:21 PM   #10
moosestang
6th Gear Member
 
Join Date: Sep 2006
Vehicle: 2006 mustang gt
Location: Gainesville, FL
Posts: 11,253
Default

Quote:
Originally Posted by jpplaw View Post
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.
My FPDC is 20 at 70mph, I think it's the same at idle, but I've never looked at it when idling.
__________________
Boost or Buell, decisions, decisions.

whipple HO SC,FRPP k springs, Pypes mid mufflers, hurst, frpp TB, 4.10's, spohn lca's, adj. UCA, relo brackets, 1 piece DS, spec stg 3+ clutch. 12.52@117.6mph so far with a 2.01 60 ft time

Pumpkin jacking addict
moosestang is offline   Reply With Quote
Old 05-08-2013, 08:21 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 01:16 AM.

© Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup