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John Stafford
DieHard
Qld.
Soarer UZZ31 GT-L V8 and a UZZ32 # 514

Posts: 692
Reg: 02-2010

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 Thursday, October 31, 2013 - 09:28 am, by:  John Stafford (Johng12) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
I want to test what fuel pump pressure is getting to my fuel rail. Has anyone done this and how did you connect a fuel pressure gauge to the rail and where abouts did you connect to?
Matthew Salkeld
TryHard
South Australia
1JZ powered 180sx

Posts: 104
Reg: 07-2008

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 Thursday, October 31, 2013 - 04:42 pm, by:  Matthew Salkeld (Munkymatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
in theory you can plumb it in series with the fuel filter, it should see the same pressure as the rail itself (after the fuel filter).
Tom Richards
Goo Roo
nsw
V8

Posts: 1732
Reg: 08-2005

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 Thursday, October 31, 2013 - 07:38 pm, by:  Tom Richards (Tomr) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
wouldnt you want to measure it after the regulator?
Matthew Salkeld
TryHard
South Australia
1JZ powered 180sx

Posts: 106
Reg: 07-2008

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 Thursday, October 31, 2013 - 07:45 pm, by:  Matthew Salkeld (Munkymatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
The fuel after the reg is just being dumped back into the fuel tank...
Matthew Salkeld
TryHard
South Australia
1JZ powered 180sx

Posts: 107
Reg: 07-2008

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 Thursday, October 31, 2013 - 08:26 pm, by:  Matthew Salkeld (Munkymatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


You can take a pressure reading from anywhere between the fuel filter and the pressure regulator... there is no optimal location; they all give the same pressure reading (variance will not be worth worrying about, though it does exist at high flow rates, where the duty cycle is very high!)
John Stafford
DieHard
Qld.
Soarer UZZ31 GT-L V8 and a UZZ32 # 514

Posts: 700
Reg: 02-2010

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 Saturday, November 02, 2013 - 10:14 am, by:  John Stafford (Johng12) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
thanks for that diagram Matthew and explaining that the fuel at the reg just goes back to the tank, that is clear.
My question is:
If you just measure fuel pressure without being under load, will it be true or does it vary when you are full throttle and full load?

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