[Healeys] su pumps again

[Bob Spidell]

According to the Wiki article the 'film was developed in the mid-1950s,' which could mean original BN1/2/3(shout out to Patrick)/4 pumps might not have it. Though 'old school' petrol didn't have ethanol in it, I suspect the distillation process of the time allowed other nasty stuff in the fuel, and gasoline itself is a pretty good solvent. Maybe some other barrier material was used? 

Geez ... you know you're a 'Healey Nut' when you have to know what the plastic film on SU pump diaphragms was made of (I did major in chemistry for a couple years and still have a passing interest--that's my story anyway). 


----- Original Message -----

From: "Oudesluys" <coudesluijs at chello.nl> 
To: "Bob Spidell" <bspidell at comcast.net> 
Cc: josef-eckert at t-online.de, "Austin Healeys List" <austinhealeyslist at gmail.com>, "healeys" <healeys at autox.team.net> 
Sent: Wednesday, November 23, 2016 6:22:12 AM 
Subject: Re: [Healeys] su pumps again 

Could well be although I am not sure how long mylar has been commercially available. The SU pump may predate the days of mylar? 
Kees Oudesluijs 

Op 23-11-2016 om 15:14 schreef Bob Spidell: 



re: "...The plastic foil is on the bottom of the diaphragm opposite the stem ..." 

That's where it's been on every old pump I've disassembled; the newer diaphragms I've bought didn't have it. I've always assumed the 'plastic foil' was mylar: https://en.wikipedia.org/wiki/BoPET 

Bob 




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