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Date:         Mon, 6 Mar 2006 09:23:31 -0500
Reply-To:     jake beaulieu <jbeaulie@ND.EDU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         jake beaulieu <jbeaulie@ND.EDU>
Subject:      Re: permanent fuel pressure gauge
In-Reply-To:  <00d301c6411a$2191db80$460d4ed8@workshop32>
Content-Type: text/plain; charset="us-ascii"

I don't think anybody proposed running a line from the fuel rail all the way up to the dash. Max proposed running a 1 inch high pressure fuel line from the T in the fuel rail to the electric sending unit. Just 1 inch, not much different than the lines running to the injectors or FPR. Ideally a person could track down a proper fitting with male threads to screw directly into the fuel rail and female threads to accept the sender. I agree that running a pressurized fuel line up into the dash is a very bad idea, but nobody proposed such a thing.

"...to monitor pressure for some future fuel system problem is foolish, period! Wait till you have a problem and then run a under-hood temporary gauge, hooked right up to diagnosis it, being very careful then at that!"

The advantage of having real-time fuel pressure readings is that you can instantly diagnose INTERMITENT problems. You know, the kind that are difficult to reproduce while the van is in the garage with a temporary pressure gauge attached.

Jeez, and its only Monday morning! Jake

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of Raceingcajun Sent: Monday, March 06, 2006 7:33 AM To: vanagon@GERRY.VANAGON.COM Subject: Re: permanent fuel pressure gauge

Let me start by saying I'm not trying to get on a soapbox, or a high-horse, etc! Forgive my dumb question, but let me see if I got this right? You have a rubber hose under full working fuel pressure (maybe 30 lb's right), running full length of your bus, including run to the interior? Also in this mix is an $12.00 aftermarket gauge. And now you purpose to do the same thing on an Audi CIS system, running full working pressure of 75 lb's to 85 lb's. CAN YOU SAY BOOM! With that much pressure, a running pump, an accumulator. If the hose came off, or was cut in an accident, or the hose burst at the gauge, or the $12.00 gauge failed. You might get as much as a gallon of fuel in your lap before the pressure relived itself, if the pump wasn't still running. But you have no spark to ignite the fuel you say. A brush type motor makes sparks while running. Wipers, Blower motor, turn signal flasher, etc. (key word there being FLASHER) Anyway I'm not trying to insult you, and sorry for the rant, but I think this is foolish!

I thought this topic started out as an electric sending unit type gauge, with no hose's involved idea? That wouldn't be too bad hooked up right. But 20 ft of rubber hose. No way, I don't care how careful you are, or how high a quality hose you use. NO WAY! This whole idea of a dash mounted diaphragm antilog fuel gauge, to monitor pressure for some future fuel system problem is foolish, period! Wait till you have a problem and then run a under-hood temporary gauge, hooked right up to diagnosis it, being very careful then at that! Come on guy's THINK!

LET THE FLAME WARS START!

Howard

Two wrongs don't make a right, But three lefts do.

Subject: Re: permanent fuel pressure gauge

> I've done just as you've described a year ago with the additional step of > taking my oil temp gauge and adding water temp to it.

Bought a generic > VDO water temp sender at Napa of all places for like $12 the test equipment is spozed to hok up. Fins a safe place

> Now I will do the same thing to my 87 Audi 4kq except I''ll need a higher > reading Oil pressure gauge and senders as the 5 cyl does fuel pressure > closer to 85-90 psi.


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