Fuel pressure?

Post any Technical questions, advice or problems here

Moderator: Focus ST Moderators

Post Reply
User avatar
Stitch
+
Posts: 1873
Joined: Wed Jan 30, 2013 4:16 pm
Make: Volvo
Model: C30
Type: slow
Year: 2011
Location: Slaap Stad

Fuel pressure?

Post by Stitch » Mon Apr 01, 2013 12:49 am

hey guys

I have been having some issues with my car where she would push well mid range and then lose boost+power and it would pick back up again through the higher rpm. That is with stage 2 SW and stock SW. Initially thought it was over boost

I ran logs on my car and have been told that I have fuel pressure issues.

I booked my car in at Ford on Thursday asking them to check the fuel pump and injectors and make sure all is well there. I got a call back later that morning saying my car is ready to collect and the problem is sorted. Got to Ford and all they did was (I quote) "clean pcu connector" and "program the pcu" THAT IS IT... They called me confirming that they experienced that same issues I had when test driving. Car had stock map loaded. But that is another pain altogether... They flat out refused to believe me that the pressure was low. They said the management system will give out errors if it really is too low. Is that true?

Although the car is running better now with the stock map and stage 2 mods (no I'm not crazy). It really is. I ran logs again and still have low pressure at high rpm 250kpa.

Could anyone out there please post some logs of their fuel pressure under load and idle? I would get 360/370kpa at idle. at about 5500rpm it drops down to 250 kpa. I have been told that this is not correct and could possibly be the cause of my loss in power.

Cheers
renier_cpt wrote:
You're going to break the interwebs Samir! :lol:

User avatar
P Dubs - C21
Site Administrator
Site Administrator
Posts: 39394
Joined: Wed Mar 12, 2008 9:12 am
Make: Ford
Model: Focus
Type: ST
Year: 2006
Location: Retired

Re: Fuel pressure?

Post by P Dubs - C21 » Mon Apr 01, 2013 7:15 am

Come make a turn at my house before lunch and I will check for you. Maybe you can actually bring me some Mac d's for lunch and I will explain to ford as well what I see. Lol
C21 Dreamscience Team - Still The Benchmark
http://www.dsci.co.za
RS = 12.4 sec @ Killarney 2011

BT ST 1km sprint = 279km/h @ ODI 2014
QM = 12.1 @ Killarney - MSA 2013

Image

radmoodley
+
Posts: 2001
Joined: Sun Sep 17, 2006 7:44 pm
Make: Ford
Model: Focus
Type: ST PB
Year: 2006
Location: Krugersdorp

Re: Fuel pressure?

Post by radmoodley » Mon Apr 01, 2013 10:34 am

You should get around 400kPa on idle and around 390kPa under full load at 6000rpm...If its anything below 300kPa you have problems, start with the fuel filter (replace) then check fuel pump voltage...You can also check the rail pressure with an external gauge with the factory connection on the right of the fuel rail.

User avatar
Oom Piet
+
Posts: 5672
Joined: Wed Feb 06, 2008 11:28 am
Make: Ford
Model: Focus ST
Type: 350R
Year: 2010
Location: Port Elizabeth

Re: Fuel pressure?

Post by Oom Piet » Mon Apr 01, 2013 11:52 am

My fuel pressure is around 390kpa at idling and under full boost it drops to 350kpa and never goes lower than that.
Dreamscience C21 Software
SAIC Intercooler
Karter Performance Boost Pipes
RS Fuel Pump
RS Turbo
RS Internals
Darton Sleeves
AS Motorsport Custom Induction
eBoost Controller & Gauge
Innovate AFR Gauge
OB1 Powered

User avatar
P Dubs - C21
Site Administrator
Site Administrator
Posts: 39394
Joined: Wed Mar 12, 2008 9:12 am
Make: Ford
Model: Focus
Type: ST
Year: 2006
Location: Retired

Re: Fuel pressure?

Post by P Dubs - C21 » Mon Apr 01, 2013 12:45 pm

He was here now and we spoke to the ford guys... They will check again in the week but in the meantime he must just cruise. His FRP is dangerously low...
C21 Dreamscience Team - Still The Benchmark
http://www.dsci.co.za
RS = 12.4 sec @ Killarney 2011

BT ST 1km sprint = 279km/h @ ODI 2014
QM = 12.1 @ Killarney - MSA 2013

Image

User avatar
Oom Piet
+
Posts: 5672
Joined: Wed Feb 06, 2008 11:28 am
Make: Ford
Model: Focus ST
Type: 350R
Year: 2010
Location: Port Elizabeth

Re: Fuel pressure?

Post by Oom Piet » Mon Apr 01, 2013 12:55 pm

P Dubs - C21 wrote:He was here now and we spoke to the ford guys... They will check again in the week but in the meantime he must just cruise. His FRP is dangerously low...
Why? what do you think it is? Dirty fuel lines / filter or the pump? The fuel pumps rarely pack up especially not on the later FL models.
Dreamscience C21 Software
SAIC Intercooler
Karter Performance Boost Pipes
RS Fuel Pump
RS Turbo
RS Internals
Darton Sleeves
AS Motorsport Custom Induction
eBoost Controller & Gauge
Innovate AFR Gauge
OB1 Powered

MrMazda
+
Posts: 5085
Joined: Mon Dec 05, 2011 11:17 am
Make: Mazda
Model: 2.0 Active
Type: 2.0 Active
Year: 2010

Re: Fuel pressure?

Post by MrMazda » Mon Apr 01, 2013 1:32 pm

Oom Piet wrote:
P Dubs - C21 wrote:He was here now and we spoke to the ford guys... They will check again in the week but in the meantime he must just cruise. His FRP is dangerously low...
Why? what do you think it is? Dirty fuel lines / filter or the pump? The fuel pumps rarely pack up especially not on the later FL models.
Unless the tank was run bone dry a few times, modern fuel pumps don't take kindly to such abuse.
Current: 2010 Mazda 6 Active, 2002 Bantam B3 1300, 2010 Sirion 1.3.
Ex:Mazda 323s X 5 1026 000km & 626s X 3 515 000km & B2200 D/c 4X4 345 000km & Meteor GLi 1.6i 120 000km, BMW 528i X2 44 000 km
Mazda 6 2006 Original 222 000km

radmoodley
+
Posts: 2001
Joined: Sun Sep 17, 2006 7:44 pm
Make: Ford
Model: Focus
Type: ST PB
Year: 2006
Location: Krugersdorp

Re: Fuel pressure?

Post by radmoodley » Mon Apr 01, 2013 2:31 pm

That is possible MrM...Its not usual for the pump to give problems unless something went wrong before, @Dubs, what happens when the pressure is too low? Danger of running lean?

User avatar
P Dubs - C21
Site Administrator
Site Administrator
Posts: 39394
Joined: Wed Mar 12, 2008 9:12 am
Make: Ford
Model: Focus
Type: ST
Year: 2006
Location: Retired

Re: Fuel pressure?

Post by P Dubs - C21 » Mon Apr 01, 2013 3:19 pm

It runs at a 15.2 Afr then :shock:
C21 Dreamscience Team - Still The Benchmark
http://www.dsci.co.za
RS = 12.4 sec @ Killarney 2011

BT ST 1km sprint = 279km/h @ ODI 2014
QM = 12.1 @ Killarney - MSA 2013

Image

User avatar
Stitch
+
Posts: 1873
Joined: Wed Jan 30, 2013 4:16 pm
Make: Volvo
Model: C30
Type: slow
Year: 2011
Location: Slaap Stad

Re: Fuel pressure?

Post by Stitch » Mon Apr 01, 2013 7:42 pm

A big thanks to Dubs for helping me out today. Was good to meet you!

I hope Ford can find the problem. Dubs drew them a pretty picture as to where the problem lies.

You know it's a sad day when Dubs tells you your car is lazy.... lol
renier_cpt wrote:
You're going to break the interwebs Samir! :lol:

User avatar
P Dubs - C21
Site Administrator
Site Administrator
Posts: 39394
Joined: Wed Mar 12, 2008 9:12 am
Make: Ford
Model: Focus
Type: ST
Year: 2006
Location: Retired

Re: Fuel pressure?

Post by P Dubs - C21 » Mon Apr 01, 2013 9:00 pm

Lol. Sorry man. But it felt lazy. Lol. I will explain to them in an email what to look for and send them the data. Hopefully that will help them...
C21 Dreamscience Team - Still The Benchmark
http://www.dsci.co.za
RS = 12.4 sec @ Killarney 2011

BT ST 1km sprint = 279km/h @ ODI 2014
QM = 12.1 @ Killarney - MSA 2013

Image

Cecil599
-
-
Posts: 2
Joined: Sun Jun 23, 2019 12:14 pm
Make: Volvo
Model: S40
Type: T5
Year: 2005

Re: Fuel pressure?

Post by Cecil599 » Sat Jun 29, 2019 3:23 pm

Hi. I know this is a very old post, but mine is 390kpa at idle and 460kpa +- when under load. I had a injector 3 open circuit issue. Couldn't find anything wrong with the wires on said injector but still no power on the connector or wires , so out of frustration I bridged inj 3's wires to inj 2's wires (seeing that all the injectors pulse at the same time. Misfire went away but car hesitates on throttle response. Do you think the FPS is causing the overfueling and thus causes the stutter? Can the FPS cause the ECU to cut power to inj 3? The car has got Celtic stage 2 software.

Post Reply

Return to “General Focus Tech Talk”