A lister wrote:
This sounds to me like a classic case of vapour lock, caused by an
overheating and/or deteriorating injection pump. The worsening nature of
your problem seems to indicate the pump is on the way out. The giveaway
here is that it's happening when the temp is above 85 deg.
People will say you can fix the problem by replacing the old Lucas pump
with a Bosch one, but this does bugger all. My car has the Bosch one
fitted, which is mounted externally behind the left rear wheel,
supposedly to increase airflow, but it still suffers from the same
problem. My local parts dealer told me the Bosch unit
people fit is only a wiper motor, hence, not heavy duty enough.
I have been using a Bosch pump on my PI TR6 without any problem in the warm
Southern California weather. Maybe my Bosch pump is a different model than
the one being used above. I have been told that the Lucas pump is a
modified wiper motor; I've never heard this in reference to a Bosch pump.
There seems to be agreement that the Bosch pumps are great at pushing fuel
out but poor at sucking it in. That's why they are usually installed below
the plane of the fuel filter/tank or have a priming pump installed inline.
The cooling coil is an option, for sure. I would also say that a Bosch
pump is another.
Dave,
San Diego, Ca
1970 TR6 PI ... with Bosch pump in car; Lucas pump on shelf.
|