[Roadsters] Fuel Pump Question

[Joe Russo]

Thanks Garth and Gary,

Fuel pump #3 (from a spare engine) seems to have done the trick.  I checked
the
spacer and it is correct (compared to 2 others on U20 engines). I bought a
couple of these spacers new from Nissan a few years back.

I will pick up a repair kit and rebuild the NOS unit.  The diaphragm is petty
dried out - lots of chalky black rubber on it - down-right grungy, It's not
very
rubbery at all. I read somewhere, probably this list, the original rubber
can't
handle some of the modern fuel additives - I would have thought it would have
lasted longer than 6 months...

This car also happens to have an electric fuel pump that is mounted but not
connected.  I works fine except I hate the clicking noise it makes.  I keep
it
there "just in case".

Getting her ready for Watkins Glen this weekend!

Thx
Joe

-----Original Message-----
From: Garth Cuthbert [mailto:gcuthber at telus.net]
Sent: Tuesday, September 08, 2009 11:54 AM
To: 'Joe Russo'; datsun-roadsters at autox.team.net
Subject: RE: [Roadsters] Fuel Pump Question


Seems the fuel pump diaphragm is failing due to fatigue by travelling further
than design. You may want to check the thickness of the spacer between your
block and fuel pump. When I rebuilt my U20 the original spacer was 0.187". I
installed a spacer included in the Nissan gasket and seal kit I got for the
rebuild. It was almost twice the thickness.

It might be something else.

G

-----Original Message-----
From: datsun-roadsters-bounces at autox.team.net
[mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of Joe Russo
Sent: September-08-09 8:22 AM
To: datsun-roadsters at autox.team.net
Subject: [Roadsters] Fuel Pump Question

I put a NOS fuel pump on my U20.  After about 6 months, fuel started coming
out
of the weep holes on lower part of the pump body.  I suspect these holes are
there to exhaust the air from the diaphragm. SO I pulled the pump and the
diaphragm was decomposing (old rubber) but I could see no holes .  I replaced
the pump with a spare I had taken from a running engine.  It too has fuel
coming
from these holes...another bad diaphragm?

Could it be any thing else -  like a clog in a carb banjo bolt filter?  Car
starts easily and runs strong - as long as you don't mind the smell of gas
(not
to mention, going up in flames!)  Carbs are new beauties from Keith!

Thx
Joe
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