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[Healeys] BN2 Fuel Pump

To: healeys <healeys@autox.team.net>
Subject: [Healeys] BN2 Fuel Pump
From: Bob Spidell <bspidell@comcast.net>
Date: Sun, 5 Sep 2010 01:27:31 +0000 (UTC)
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 
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