Ed
Interesting article. Personally, I've never come across this problem in terms
of modern fuels
causing pumping problems per se.
However, what I *have* encountered many times is a failure of rubber (for want
of a better word)
components in the fuel system itself. In non-injection cars, I've seen many
mechanical pump failures
where the chemical mix in unleaded fuels is well known to attack those
components that ran happily
for years on leaded. This is a real problem on Triumph fuel injection cars and
the only way round it
is to do a full service exchange on the metering unit, low pressure return
lines and pressure relief
valve. However, its clear that unleaded fuel (as a generic) seems to come in
different complexions
in terms of additives used and what we have in the UK may not be the same as in
the US. I do know
that when unleaded was first introduced in New Zealand some years ago at the
same time as leaded was
banned, there were horrendous problems with the fuel itself causing breakdowns
everywhere and
nothing to do with valve seat recession.
IMHO, if this issue worries you and your mechanical pump seems to be working
OK, either leave it
alone or replace the *rubber* parts with neoprene units which are known (in the
UK anyway) to be
completely unaffected by unleaded.
FWIW ....
Jonmac
Randall may have another view?
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