[V8] Fuel pressure gauge

[Tony and Lillie]

On this subject, I was just at Harbor Freight, and saw a kit for checking 
fuel pressure. It included the "T" and everything, from wht I saw. I believe 
it was $25 or so, but I wasn't really paying attention to the price.

Tony Hoffman

----- Original Message ----- 
From: "d saad" <dsaad at icehouse.net>
To: <v8 at audifans.com>
Sent: Tuesday, February 13, 2007 10:12 AM
Subject: Re: [V8] Fuel pressure gauge


>
>
> 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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