The
Oldcorollas FAQ
An FAQ dealing with KE1x to KE7x Toyota Corollas
Supplement to http://groups.yahoo.com/groups/oldcorollas
The stock diaphragm-type mechanical fuel pump provides between 2.8 and
4.5 psi of fuel
pressure to the carburettor. It is actuated via a sprung arm, which has
its own lobe on the camshaft. There is also supposed to be a spacer
between the block and the fuel pump. If you keep breaking pump arms and
springs, this could be the reason. Otherwise, the only problem with
them is that the spring wears out after prolonged (ie: 25 years) use.
If you have an uprated carb, this may need
to change as per specs of the carb. Usually, better carbs get pretty
fussy. For example a sidedraft will want between 2.5 and 3 psi, but
will need a pump with alot of fuel flow (as they use lots of fuel),
which means you'll need a pressure regulator, which will have a return
line. However, Corollas don't have a return line into the tank, so just
T the fuel return back into the line before the fuel pump.
If you fit an electronic pump, simply make a metal plate to go over the
hole in the block where the pump was. To make it look nice, trace a
fuel pump gasket to make your plate.
Fuel Miser make rubber diaphragm kits to rebuild stock pumps, they
retail for about 90 bucks.