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miles

posted on 3rd Sep 04 at 20:39

Thats right blundey.

If its not connected it would overfuel on an n/a car, more so at idle, over-run and low throttle positions.

On a turbo it would melt, lol.

You'd need to block the vacuum pipe though else you'd have an air leak.


myke

posted on 3rd Sep 04 at 11:49

always wondered that.
usefull info, cheers.

so if you didn't connect the vacuum pipe, would it just overfuel or suck in loads of unmetered air?


blundey

posted on 3rd Sep 04 at 10:47

so 44.1 psi on average....Thanks miles..corrct me if im wrong.


miles

posted on 3rd Sep 04 at 10:32

14.7 psi in a bar.

It will be stamped on the side of the FPR.

The fuel pressure @ the injectors needs to be a constant 3 bar. So without the vacuum pipe the fuel pressure would be 3 bar, however there is also going to be a vacuum inside the engine, say 0.5 bar. So if its pushing 3 bar, engine is sucking 0.5 bar you get 3.5 bar of fuel pressure. With the vacuum pipe connected the fpr knows the vacuum in engine, so adjusts accordingly, so you get, say, 2.5 bar from the reg plus the 0.5 bar = 3 bar.

Obviously the vacuum inside the engine changes with load, throttle position etc.

Its the same for turbos, but when its under boost its added pressure to the reg to overcome the boost pressure, for instance 1 bar of boost, you'd need 4 bar of fuel pressure to get 3 bar....

Hope that helps and makes sense.


blundey

posted on 3rd Sep 04 at 10:00

whats that in PSI?


myke

posted on 2nd Sep 04 at 22:53

what difference does the vacuum have on the fuel pressure?
always wondered why it was there.
must serve a purpose, but dunno how or why.


miles

posted on 2nd Sep 04 at 20:58

Most vauxhalls are 3 bar. Measured at idle with the vacuum pipe disconnected.


blundey

posted on 2nd Sep 04 at 19:19

Anyone know the set "standard" of the fuel pressure for a corsa C 1.2 ?

I thought it was a set standard something like 45psi?

Anyone know? It aint in the haynes manual.

Cheers