Listers,
I'm most familiar with BJ8 fuel pumps--being able to assemble at least two
working units out of a large collection of parts at any given time--but I'm
having trouble with a BN2 fuel pump. The BJ8 pumps have a valve body with two
thin reed-type valves--one on the suction side and one on the pressure side
(they are set up differently, of course, but I believe the valves are the
same). Anyway, my BJ8 pumps a few times when energized and settles into a
steady rhythm of a pump every 5-6 seconds with the engine not running. With the
engine running, the pump speeds up according to engine speed; a pump every 2-3
seconds at idle, a couple pumps a second during acceleration, and a steady pump
every 1-2 seconds at cruise. Very logical.
Our BN2's pump--a brand new SU electronic--is a different design. There is only
one valve--a brass disk, basically--on the output side and nothing on the
suction/inlet side (it almost seems like it's supposed to siphon as much as
pump). This pump behaves erratically--it'll pump rapidly when the key comes on,
and seems to settle down but then starts pumping erratically. It pumps almost
continuously with the engine running--the engine runs fine, BTW--but it's still
an erratic continuous.
Is this typical for the BN2 pump? It appears this design is way inferior to the
BJ8 pump design--in spite of the lovely brass machine work inside--and I'm glad
to see SU improved the design (and probably make it cheaper, to boot), but it
doesn't seem right to me. I haven't ruled out air leaks, but we've checked,
tightened, and checked and tightened again and nothing seems to change. Not
having a reverse-flow preventing valve on the inlet side just don't seem right,
somehow.
All info, SWAGs, etc. accepted/appreciated.
Bob
--------------------------------
Bob Spidell - San Jose, CA
_______________________________________________
Healeys@autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation $12.75
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
|