Replacing the Fuel Pump
The VW fuel pump
will run trouble free for many years but like all things they will finally
wear out. When it comes time to replace your pump there are a few things
to know to do the job right. There are three basic pumps for the 40HP
and newer air cooled VWs that all bolt on the same and look very similar.
|But they are not exactly
older 40HP 1200cc motor and the even older 36 HP pump (which is completely
different and bolts to the side of the motor and not shown here) have
a fitting that screws into the inlet side of the pump.
|The two later pumps have
brass lines that are designed to have the fuel lines pushed on. The
braided German fuel line will push over these and make a leak proof
connection without a clamp. They work much like a Chinese finger trap.
The American fuel line of similar size needs to have small clamps
to be safe.The later
pump used on cars with generators stands taller than the pumps used
on the even later motors with alternators. The alternator pump is
shorter and tipped back to make room for the larger alternator.
|SHORT PUMP This later
pump could be made to work on the older motor but the drive pin is
shorter than that of the original pump. RODS Using this pump with
the wrong pin could ruin it. On the other hand the older pump will
not pump with the short pin and will not fit under the alternator.
So you see the need to match the pump to the motor, or more specifically
to the alternator or generator. Before installing the pump you need
to pack the underside with grease to keep it lubricated.
|I also make a habit of
removing just enough material off the outside of the fuel pump stand
to make it slightly loose in the block. This can prevent it from swelling
and seizing the pin at a later time.
|The pump is right out
there where you can see it and is held on with just two 13mm nuts.
A 13mm flex socket is handy for the back nut. Just
be sure you get the right pump and it should give you good service
for many more years. You
can see this and more in detail in Bug Me Video Vol.3, Engine rebuild.
Bug Me Video, Inc.
to Tech Talk with Rick index page Next>>
us | Contact |
Events | Forum
| History | Home
| Images | Interactive
| Links | Tech