Modded Mustang Forums banner
Cancel
Create thread New Garage Forums

FUEL PROBLEMS

Jump to Latest
1 - 20 of 20 Posts
B

BlackStallionGT

· Registered
Joined
·
24 Posts
Discussion starter · #1 ·
My car is getting hiccups when driving, sometimes just cruising around town and other times at full throttle- it feels like when you hit the fuel cutoff at top speed- its throwing a p0191 code fuel rail pressure chk performance- i put a new fuel rail pressure sensor, new fuel filter, and changed my spark plugs for good measure- but unfortunately this has not helped... Im guessing with the mods i have, the car may not have enough power in the fuel system... is the pump failing you think? car starts up fine, doesnt stall out, and pulls hard at WOT, but sometimes it hiccups or bucks as mentioned...

Does a 2010 GT have a single fuel pump or dual? I was looking at the walbro 255lph, but they seem to all say (1pump) does that mean i need 2 ?

What about larger injectors and fuel rails?

Any and all help is greatly appreciated

Ryan
 
Save
Reply Quote Like Like
#2 ·
You are nowhere near maxed out on a stock pump, I have a supercharged setup and Im still on the stock pump, see if you can data log what the pump duty cycle is at as well as the injector duty cycle, also did this recently start when you got a new tune, and is your car an auto or manual, but it is more than likely the pump.
 
Save
Reply Quote Like Like
#4 ·
It's probably the pump or the module that sends the pump it's signal. Data log to find out for sure and fix it ASAP. Even though you are not running that much power you still don't want to run the risk of running lean. Detonation is bad no matter what power level you are at.
 
Save
Reply Quote Like Like
#5 ·
^^ Dads foxbody had that happen, pump failed, car leaned when he got on it, blew a top of the piston off and lodged it against the side of the cylider wall. Drove the thing for an hour to get home.
 
Save
Reply Quote Like Like
#7 ·
Backatitagain said:
Pulling the coils and testing them with a multimeter is about as easy as it gets to rule those out...or in.
Click to expand...
Well, if you have a fuel rail pressure code, why would you look at the ignition system? That's like getting a low tire pressure light and checking your brake fluid.
 
Save
Reply Quote Like Like
#8 ·
BlackStallionGT said:
My car is getting hiccups when driving, sometimes just cruising around town and other times at full throttle- it feels like when you hit the fuel cutoff at top speed- its throwing a p0191 code fuel rail pressure chk performance- i put a new fuel rail pressure sensor, new fuel filter, and changed my spark plugs for good measure- but unfortunately this has not helped... Im guessing with the mods i have, the car may not have enough power in the fuel system... is the pump failing you think? car starts up fine, doesnt stall out, and pulls hard at WOT, but sometimes it hiccups or bucks as mentioned...

Does a 2010 GT have a single fuel pump or dual? I was looking at the walbro 255lph, but they seem to all say (1pump) does that mean i need 2 ?

What about larger injectors and fuel rails?

Any and all help is greatly appreciated

Ryan
Click to expand...
Single pump - just like any other 05-09 GT - but the fuel level sender is slightly different.
 
Save
Reply Quote Like Like
Discussion starter · #9 ·
DiMora said:
Single pump - just like any other 05-09 GT - but the fuel level sender is slightly different.
Click to expand...
So i can just swap in a walbro no problem then... even if it says 05-09 models?

to me it makes sense to just upgrade the sytem to handle more power since a supercharger will inevitably be in the future equation
 
Save
Reply Quote Like Like
Discussion starter · #10 ·
MikeStud said:
Are the only performance mods the tune and catback?
Click to expand...
no i need to upgrade the signature on here

Ive got a JLT series 3 intake, BBK throttlebody, Granatelli Hot Street coilpacks, steeda UDP's, Magnaflow Catback with cutouts, bamatune
 
Save
Reply Quote Like Like
#11 ·
Honestly unless your going going above what the stock engine will handle, your not gonna really need to worry about the fuel pump, you could just get a gt500 pump, or use the stock pump and a bap.
 
Save
Reply Quote Like Like
#12 · (Edited)
The GT500 pumps will probably be the easiest to deal with, except maybe the install part of it. But find out first if that is your issue. Throwing parts at a problem is not always the most cost efficient way to solve the problem.
 
Save
Reply Quote Like Like
#14 ·
Im just wondering say the fuel pump is his problem, what causes that, saying the car fuses, and voltage are correct and nothing is wrong with the car, is it a mechanical or electrical faliure.
 
Save
Reply Quote Like Like
#15 ·
If you replace the pump, get an Aeromotive Stealth 340. Its good to 500hp and costs $150. I had one in my 2010, worked perfect. GT500 duel pumps and hat is a lot of money if you don't plan on getting a S/C. But to answer one of the questions you asked about, YES, the 05-09 pump is the same with same part number. I even pulled mine out of my 2010 and the manufacture date was 2008.

Here are some things that can cause the code p0191.

- High fuel pressure
- Low fuel pressure
- Damaged FRP sensor
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel
- Vacuum leaks

But I was thinking... maybe you have 2 problems going on, and are associating them as 1. I'm not a mechanic, but what if: You are getting the CODE from a Vac leak or a sensor but you are getting the hesitation from those coil packs or the tune? Maybe something to consider.
 
Discussion starter · #16 ·
stri8ed said:
If you replace the pump, get an Aeromotive Stealth 340. Its good to 500hp and costs $150. I had one in my 2010, worked perfect. GT500 duel pumps and hat is a lot of money if you don't plan on getting a S/C. But to answer one of the questions you asked about, YES, the 05-09 pump is the same with same part number. I even pulled mine out of my 2010 and the manufacture date was 2008.

Here are some things that can cause the code p0191.

- High fuel pressure
- Low fuel pressure
- Damaged FRP sensor
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Fuel
- Vacuum leaks

But I was thinking... maybe you have 2 problems going on, and are associating them as 1. I'm not a mechanic, but what if: You are getting the CODE from a Vac leak or a sensor but you are getting the hesitation from those coil packs or the tune? Maybe something to consider.
Click to expand...
Right on with the response- I have been running the coils and tune for several thousand miles and have had superior performance (I know I know some people swear they are crap or worthless.... none of you guys though) so I'm doubting it was that - it was after a day of some lead foot driving up in the mountains that it started... I changed the fuel filter and plugs and that didn't resolve the issue...they were due anyhow...I changed the fuel rail pressure sensor as I read on the forums somewhere that the sensors tend to give out or burst...but mine wasn't broken or anything... changed it anyways... still having the problem today even after running a bottle of cataclean from AM as well as a chevron fuel system cleaner...

If I dropped cash on a boost a pump, if the prob was the pump, it would be a waste.
I may need to have a shop check it out- :( installations aren't really much of an issue but finding the source seems to be stumping me this time-
 
Save
Reply Quote Like Like
#20 ·
07 Boss said:
Well, if you have a fuel rail pressure code, why would you look at the ignition system? That's like getting a low tire pressure light and checking your brake fluid.
Click to expand...
Same reason the OP changed his plugs...he has already started chasing parts to no avail and an ignition issue has similar symptoms. Now you can rule out the easy stuff. Failing coil(s) rarely throws a code and it takes more time to post to this thread than eliminate them as part of the equation which could be a combination of failures.

...guess it helps if I set my thread notifications also.
 
1 - 20 of 20 Posts
About this Discussion
19 Replies
9 Participants
Last post:
Backatitagain
Modded Mustang Forums
posts
6.3M
members
83K
Since
2005
A forum community dedicated to all Ford Mustang owners and enthusiasts. Come join the discussion about performance, racing, builds, modifications, troubleshooting, maintenance, and more!
Full Forum Listing
Explore Our Forums
96 - 04 Modular Mustangs 5.0 Mustangs New Members Introductions Classic Mustangs