Fuel pump check valve and other sundry items

[Philip Rose]

Hmmm. I hope  that schools these days aren't teachinh that "citric acid is the active ingredient" of vinegar. No, vinegar is very dilute "acetic acid" (about 5%). I doubt you need be too concerned about easily damaging your paint with vinegar--especially if you've already tried using the much-stronger "muriatic acid" and found that it was relatively harmless/ineffective (at least that's what I think you had indicated).

Assuming that the trouble spots are not on horizontal surfaces, you might try saturating a wad of cotton with the vinegar--or other liquid-- and lay that (wet cotton) in contact with the areas that need cleaning in order to give the vinegar some time to work. You could test on an inconspicuous area of paint to make certain that no damage occurs.

Have you tried getting advice about this at a good detail shop? Also, you might find something useful at a ceramic tile store which should carry some kind of liquid preparation used for cleaning grout (cement) from tile surfaces. Don't know about effect on paint, though. Good luck.

Phil



On Nov 10, 2011, at 10:01 AM, "Jay Kempf" <jkempf at madriver.com> wrote:

> Thanks for the vinegar idea. Hope it works. I would guess it is mild citric
> acid that is the active ingredient. Assuming short enough dwell time and
> quickly flooding with a lot of clear water that might not damage the paint. 
> 
> Only a few things left to get now like brake bleeder valves and pads. I am
> surprised at my local NAPA and all the Euro OEM stuff they have. Painting my
> way to the finish line. After it is driveable and I can get it through
> inspection I'll worry about the exterior cosmetics. I can get a matching
> pint and go at it. From what I have been reading this car is not clear
> coated with modern urethane. Sounds like it is enamel or acrylic. 
> 
> 
> 
> 
> jfk
> 
> 
> -------------------------
> Jay Kempf
> jkempf at madriver.com
> 802 272 5868 
> 
> 
> 
>  _____  
> 
> From: Tony Hoffman [mailto:auditony at gmail.com] 
> Sent: Thursday, November 10, 2011 8:05 AM
> To: jkempf at madriver.com
> Cc: 200q20v at audifans.com
> Subject: Re: Fuel pump check valve and other sundry items
> 
> 
> Jay,
> 
> Glad to hear you are making progress, always fun to get it back together and
> go for a drive!!
> 
> Use Vinegar to remove the concrete. That works well, don't know why, but it
> does.
> 
> Tony
> 
> 
> On Wed, Nov 9, 2011 at 6:06 PM, Jay Kempf <jkempf at madriver.com> wrote:
> 
> 
> Any ideas how to
> remove concrete bits? Thoughts I have had are a vibrating engraver to
> explode the chips off the surface, muriatic acid, tapping with hammers to
> break it up... Nothing has been what I would say, effective as yet.
> 
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