[V8] Fuel pressure gauge

[d saad]

You have a few options -

-> Buy a fuel pressure tester that
comes with the adapters. Expensive, but maybe worth it for the
convenience.
-> install a permanent test port - like most cars now
have
-> go to the junk yard and get some fittings and make your
own adapter.

I did both the junkyard thing, and then put in a
permanent test port. Both were easy to do, but take time. To scavenge
junkyard parts, all I did was find some appropriate fittings, and attach
them to a brass tee which had a standard Ford style schrader valve in it.


I decided to do the permanent port when my flex line from the
right shock tower to the fuel rail started to leak. There is some risk
with this one - but mine has been there for many years now and I have had
no problems. Here is a short description on how to do it:
http://www.icehouse.net/dsaad/
This required me to have new hose
crimped on - because the soldering will destroy the old hose. It took the
guy at the hose shop a few tries to get it right, but it was cheap.


Dave

> <snip>Has anyone installed a
valve on the fuel rail to measure fuel
> pressure? I thought I
read about it somewhere.  The AF TWiki has one for
> S4/S6 cars. 
It was an incredibly valuable tool on my previous cars and
>
I'd
> like to have one to check numbers. <unsnip>
>

> Yes, I've installed a fitting on my S6.  I've also seen folks
who have
> modified their V8 fuel rail for the fitting.  I cut a
rubber section of
> the
> fuel line near the fuel filter,
installed a brass tee with two
> hose-to-pipe-thread fittings. The
third leg of the tee to a brass Schrader
> valve.  You have to use
FI hose clamps on the hoses and a metal valve cap
> on
>
the Schrader valve. The valve has a 1/4" flare fitting that's the
> most-common standard for EFI pressure gauges. The magic part is the
valve
> and it's NAPA # 209459 and I paid $3.74, (jobber price).
FI clamps are
> 705-1226 or 1227 depending on hose diameter (14 mm
and 15 mm).  I've often
> wondered why so many guys on the list
just replace the FPR without
> checking
> the pressure. 
FI pressure is critical, the ECM accepts it as a given
> pressure
and if it's off open-loop will be fat or lean and closed loop may
> not be able to squeeze the injectors enough to keep the engine
from
> running
> fat.
> Craig N.
> 90 V8
Q
> 95 S6 Avant
> 
>
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