Offline
For a long time, both here and on the autox email list, one of the major topics has been fuel pump issues. Have been searching for an exploded drawing (or photos) of the facet pump.
Here is the US patent for the newer round-body design with integral inlet/outlets - the internals are evidently the same as the gold box pumps:
https://www.google.com/patents/US7150606
The basic principle is when the electromagnet is triggered, it pulls the plunger against the spring towards the center of the magnetic field. Triggering is solid-state.
The o-ring (#34) at the left end of the tube not only seals but acts as a shock-absorber for the action of the plunger. No diaphragms are involved. As far as I can tell, the o-rings are the only rubber items in the pump.
Reasons for SU:
1) concours/original
2) cute sounds
Reasons for Facet:
1) reliability
Here is the US patent for the newer round-body design with integral inlet/outlets - the internals are evidently the same as the gold box pumps:
https://www.google.com/patents/US7150606
The basic principle is when the electromagnet is triggered, it pulls the plunger against the spring towards the center of the magnetic field. Triggering is solid-state.
The o-ring (#34) at the left end of the tube not only seals but acts as a shock-absorber for the action of the plunger. No diaphragms are involved. As far as I can tell, the o-rings are the only rubber items in the pump.
Reasons for SU:
1) concours/original
2) cute sounds
Reasons for Facet:
1) reliability
Last edited: