HELP re fuel pressure...
07-03-2006, 06:05 PM
#1
HELP re fuel pressure...
Just finished off the Cossie and went for a quick drive...it is lovely 
...BUT i noticed on my fuel pressure gauge at tick over it goes to about 38psi which my escos does too which is normal...but when you reach 0psi it should read around 50psi..well does on the Escos..on this saff the gauge dont move at 0psi... 
All vacuum pipes connected and its a brand new regulator!
...BUT i noticed on my fuel pressure gauge at tick over it goes to about 38psi which my escos does too which is normal...but when you reach 0psi it should read around 50psi..well does on the Escos..on this saff the gauge dont move at 0psi... All vacuum pipes connected and its a brand new regulator!
07-03-2006, 06:31 PM
#6
Without the pipe, it should run 3.5bar static pressure and not change apart from very minor fluctuations.
When you put teh pipe on, it should drop to less than that.
When you run boost, it should see more than that.
No:2 is bad for driveability, but some engine specs demand it. A boost gauge will soon confirm or deny this though.
Warranty?
After you fitted it? 
Of course it is.
When you put teh pipe on, it should drop to less than that.
When you run boost, it should see more than that.
No:2 is bad for driveability, but some engine specs demand it. A boost gauge will soon confirm or deny this though.
Warranty?
After you fitted it?
Of course it is.
07-03-2006, 06:37 PM
#7
The boost gauge reads perfect...although i cant get it on boost as i am running in..and its a T4 remember so way outside my running in limit 
If i had a vacuum leak wouldnt it tickover higher etc?
The gauge dont move over 37psi full stop pipe on or off????
If i had a vacuum leak wouldnt it tickover higher etc?
The gauge dont move over 37psi full stop pipe on or off????
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07-03-2006, 06:41 PM
#8
You can run it in with a few psi Phil, what do you think they did with RS500s 20yrs ago? Same goes for all new engines, dont pussy em around with no boost.
You need to see whats going on when pressure is applied IMO as with a very low vac signal, it may well do very little indeed.
You need to see whats going on when pressure is applied IMO as with a very low vac signal, it may well do very little indeed.
07-03-2006, 06:49 PM
#9
Stu you are saying without the vacuum pipe on it should run 52psi...mine runs 37psi...surely that confirms a regulator fault?..Ok once i connect and i have very little vacuum then ok it may not do much...but then this would mean its factory set wrong?
07-03-2006, 07:22 PM
#10
BTTT...is the reg faulty or i done something wrong????
I know most dont have a fuel pressure gauge....i think this could be a stark reminder to get one...as imagine if the reg is faulty or something else...the car runs FINE but if i was boosting its certain melt down very soon and bang goes alot of CASH due to 37psi fuel pressure
I know most dont have a fuel pressure gauge....i think this could be a stark reminder to get one...as imagine if the reg is faulty or something else...the car runs FINE but if i was boosting its certain melt down very soon and bang goes alot of CASH due to 37psi fuel pressure
07-03-2006, 09:25 PM
#13
I've found that life I needed.. It's HERE!!
Originally Posted by Bosch-Man
Stu you are saying without the vacuum pipe on it should run 52psi...mine runs 37psi...surely that confirms a regulator fault?..Ok once i connect and i have very little vacuum then ok it may not do much...but then this would mean its factory set wrong?
With vac pipe attatched, this normally drops down to 44 psi (3 bar) at idle, this isn't an exact figure as different engines will have different vacuum pressure acting on the pressure regulator, but it should be 52 psi when you hit 0 psi.
Have you tried adjusting the regulator to get the correct settings? Maybe it wasn't set to 3.5 bar absolute when it was built?
07-03-2006, 09:48 PM
#14
Wes fair enuff but most dont have a fuel pressure gauge so find that totally disturbing i have to adjust it ..As said even if it was under adjusted it should still move...it is AGAIN...37psi with pipe ON and OFF plus driving it to 0psi static 37psi...its like a N/A one
Got to bung a pump on it tommorrow to see if it rises.
..As said even if it was under adjusted it should still move...it is AGAIN...37psi with pipe ON and OFF plus driving it to 0psi static 37psi...its like a N/A one Got to bung a pump on it tommorrow to see if it rises.
..not just me 
08-03-2006, 05:12 PM
#23
I put 15psi into the regulator with engine running via a pump and the gauge didnt move from 37psi...is that gauge or Reg?..I need to be 100% sure....
BTW i did call today and got answer phone maybe you knew it was me via caller display!
BTW i did call today and got answer phone maybe you knew it was me via caller display!
09-03-2006, 08:15 AM
#25
Originally Posted by Bosch-Man
I put 15psi into the regulator with engine running via a pump and the gauge didnt move from 37psi...is that gauge or Reg?..I need to be 100% sure....
BTW i did call today and got answer phone maybe you knew it was me via caller display!
BTW i did call today and got answer phone maybe you knew it was me via caller display!
Answerphone has been on since i saw this topic, just in case...
09-03-2006, 08:53 AM
#29
Its less than a tenner for a basic gauge from a local hydraulics firm compete with fitings.
Just connect a cheap and cheerful gauge like that up in the engine bay, and compare it to the other gauge, then you know if the gauge is working or not.
You dont even need the engine running to test it if you use a footpump.
Far safer IMHO than taking it out and driving it to check if the gauge is working.
Just connect a cheap and cheerful gauge like that up in the engine bay, and compare it to the other gauge, then you know if the gauge is working or not.
You dont even need the engine running to test it if you use a footpump.
Far safer IMHO than taking it out and driving it to check if the gauge is working.
09-03-2006, 08:59 AM
#30
Norris Motorsport
Sounds to me like your gauge is faulty or not fitted correctly.
For the pressure not to rise or fall with vacuum/boost would indicate the regulator internal diaphragm was split and if this was the case with the fuel pump running fuel would be forced out of the vacuum union on top of the reg.
For the pressure not to rise or fall with vacuum/boost would indicate the regulator internal diaphragm was split and if this was the case with the fuel pump running fuel would be forced out of the vacuum union on top of the reg.
09-03-2006, 09:11 AM
#33
Originally Posted by Karl
Sounds to me like your gauge is faulty or not fitted correctly.
For the pressure not to rise or fall with vacuum/boost would indicate the regulator internal diaphragm was split and if this was the case with the fuel pump running fuel would be forced out of the vacuum union on top of the reg.
For the pressure not to rise or fall with vacuum/boost would indicate the regulator internal diaphragm was split and if this was the case with the fuel pump running fuel would be forced out of the vacuum union on top of the reg.
09-03-2006, 09:16 AM
#34
15K+ Super Poster!!
Phil get out and give the thing a bit of stick man
Yes you need to be carefull when running-in but for things to be in properly its needs a little lead foot occasionaly
Also have you checked the metal fuel pipes front to rear to make sure neither has had a jack under it?
Yes you need to be carefull when running-in but for things to be in properly its needs a little lead foot occasionaly
Also have you checked the metal fuel pipes front to rear to make sure neither has had a jack under it?
09-03-2006, 09:44 AM
#38
Professional Waffler
Originally Posted by Bosch-Man
Originally Posted by GARETH T
are the flow and return the right way around?
LOL...not possible on a 4x4 reg!.....I may be stupid....
