problem would not exist if the car had a return
(bypass) style regulator. The fuel would always
be flowing.
Q.- When I adjust the fuel pressure, it’s fine when it’s cold,
but then it starts dropping off. If I let it cool off, the
pressure comes back up. If I readjust it hot, then I
have too much pressure cold. What’s going on?
A.- This is a classic problem when there is a liquid filled
gauge mounted on or near the engine. The pressure
isn’t changing, it’s the gauge reacting to the under-
hood temperature. To prove it, start the engine with
everything cold, then blow hot air from a hair dryer on
the gauge. You can watch the pressure reading drop.
It’s just the nature of liquid filled gauges and hot
engines. Try to mount the gauge away from as much
engine heat as possible.
Q.- I want to run a return style system, but there isn’t
another hole in the tank. What can I do short of weld-
ing in a fitting. Can I dump it back into the feed line?
A.- Run the return into the fill neck if you have to, but you
cannot either put it into the feed line or the bottom of
the tank. Remember to keep the return line above the
fuel level in the tank.
Q.- Every Spring, I have to take apart my pump and regu-
lator apart. I store my car in the winter in a garage.
Why the sticky mess?
A.- The higher octane the gas, the quicker it
evaporates. If you leave fuel in the system, add one
of the many additives available and put in a regular
pump gas. Racing type gasoline
evaporates quickly and leaves a sticky mess that will
gum up everything. Just remember to put the right
fuel in before you go out and stand on
the throttle.
Q.- I took my pump apart, cleaned it up and tighten it
back up. Now it doesn’t want to run. What did I do
wrong?
A.- When you put the pump assembly back on the bot-
tom of the motor, be sure to draw both of the screws
up slowly and evenly. Do not over tighten them.
Make sure all of the pieces go back on the same way
they came off. Putting a grease pencil mark down the
side of the pump housing is the simple way to make
sure that you don’t put it together backwards. They’ll
fit, but they won’t flow the fuel right.
Mallory-Ignition.com
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