You should NOT have a substantial vacuum build up in the tank. This vacuum
will fight the efforts of the fuel pump and lean out the mixture thus
increasing the RPM, and if it continues over a long period of time will
collapse the fuel tank. I know I had this problem. After I cleaned out the
blocked restrictors in my fuel tank vent line I had no more vacuum build up.
Cleaning out the restrictors is definintely a better solution than driving
around with the fuel filler cap open.
Reid
'79 Spitfire (original owner)
-----Original Message-----
From: Bill Gunshannon [mailto:bill@cs.uofs.edu]
Sent: Wednesday, March 08, 2000 10:41 AM
To: reegurley@mindspring.com
Cc: spitfires@autox.team.net
Subject: Re: Fuel Tank Venting - BASIC
According to Ree Gurley:
>
>
>
> When opening my fuel filler-cap, I get a major SWOOSH of air going in. Am
I
> correct in assuming that this swoosh is NOT desirable (and indicative of
> some blockage in the canisters/lines/restrictors/vapor separator)?
Mine does too. But I think it is more because Federal Smog specs require
it rather than any blockage. I haven't realy looked at that part of my
79 Spit (if it ain't broke, don't fix it!!) but I do remember back in 72
I bought a new MG and there was a "fuel evaporative loss" collection
system that basicly sucked the fumes out of the gas tank (resulting in the
SWOOSH you heard) and injected them into the system in an attempt to burn
them.
Can anyone else confirm/deny this??
bill
--
Bill Gunshannon | de-moc-ra-cy (di mok' ra see) n. Three wolves
bill@cs.uofs.edu | and a sheep voting on what's for dinner.
University of Scranton |
Scranton, Pennsylvania | #include <std.disclaimer.h>
|