[alfa] Fuelling problems

[C M Smith <cmsmith@xxxxxxxxxxxxxxx>]

You have classic failure symptoms of the pre pump common in older fuel 
injection systems. The pump is actually two pumps, a pre pump fills the 
chamber surrounding the main pump and prevents cavitation of the main pump. 
When the pre pump fails the main pump often cavitates, especially when the 
tank is nearly empty or conditions are warm. Modern FI returns hot fuel to 
the tank via the fuel pressure regulator. This hot fuel encourages fuel 
pump cavitation.

For this reason it is not advisable to run the tank nearly dry. The less 
fuel you have the hotter the tank gets and the pre pump is often a casualty 
of this heat.

Cheers
Michael Smith
White 1991 164L
Original owner
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