Fuel pressure????
Fuel pressure????
Author
Discussion

antonyj

Original Poster:

5,254 posts

310 months

Sunday 29th October 2006
quotequote all
Just a quickie, going to check the fuel pressure tomorrow, is 33-40psi correct???

Griffter

4,143 posts

284 months

Monday 30th October 2006
quotequote all
36psi IIRC. Small variations can have quite an effect on mixture.

Ozstyle

392 posts

252 months

Monday 30th October 2006
quotequote all
Hi,
26 - 36 psi depending on plenum vacuum I believe.

FFMan

423 posts

278 months

Monday 30th October 2006
quotequote all
are fuel regulators worth having to keep the pressure more stable ?

shpub

8,507 posts

301 months

Monday 30th October 2006
quotequote all
FFMan said:
are fuel regulators worth having to keep the pressure more stable ?

Essential. Fitted as standard.

GreenV8S

31,017 posts

313 months

Monday 30th October 2006
quotequote all
Nominally 2.5 bar (37 psi +/- a couple) with no vacuum, pulled down to 1.5 bar at full vacuum.

antonyj

Original Poster:

5,254 posts

310 months

Monday 30th October 2006
quotequote all
Any ideas where to get a gauge from?
Tried the local FWB but no help

Griffter

4,143 posts

284 months

Tuesday 31st October 2006
quotequote all
Demon Tweaks et al do mechanical guages, but these aren't really suitable for mounting in the car as you have to have a pressurised fuel line coming in through the bulkhead. Electrical guages are available but much more expensive. For one-off fuel pressure monitoring and adjustment (not on the TVR) I've used a tyre foot pump guage. Unscrewed it from the footpump, and connected it to the fuel line via a length of fuel pipe and 2 jubilees. If you deliberately leave air in the length of fuel line, then the guage is only 'seeing' air and reads the air pressure - which of course is the same as the fuel pressure further down the line. Not recommended for anything other than an occasional quick check however.

clive f

7,259 posts

262 months

Tuesday 31st October 2006
quotequote all
I`ve been looking at power boost valves, are these of any benefit to the v8, used one on my old s2 v6 which made quite a difference, but the v8 is a different animal, would appreciate some expert opinions.
cant get the link up, but they are sold by rpi engineering via their e-bay shop.

GreenV8S

31,017 posts

313 months

Tuesday 31st October 2006
quotequote all
clive f said:
I`ve been looking at power boost valves, are these of any benefit to the v8, used one on my old s2 v6 which made quite a difference, but the v8 is a different animal, would appreciate some expert opinions.
cant get the link up, but they are sold by rpi engineering via their e-bay shop.


If you're thinking of the rising rate fuel pressure regulators, I'd give them a miss if I were you. It will make your engine run a lot richer when you put your foot down, but unless it was running lean previously this will not be an improvement.