Re: [MV] Fuel pressure
MVTrucker@aol.com
Sat, 19 Sep 1998 07:36:59 EDT
In response to Andreas Mehlhorn,
1. A correct fuel level contributes to a correct air-fuel mixture, but the
actual
amount of fuel delivered to the cylinders is also governed by jets,
metering
valves and manifold vacuum.and vacuum.
2. I must beg to differ with you on whether or not the pump pressure can be
modified with the addition of spacers. When I first started my MB engine
that had a rebuilt carb and a new fuel pump, the carb "flooded" and fuel
ran
out of the carb. At first this appeared to be the result of a stuck float,
wrong
level or a damaged needle or seat. Subsequent inspection indicated that
the problem was elsewhere. I installed a pressure gauge on the outlet port
side of the original style correct fuel pump and was amazed to find the
pressure to be around seven pounds per square inch (psi). I made a call
to the supplier of my parts, a large and well known parts and restoration
company here in the USA, and explained my problem. I was advised
to make some new gaskets up to use as shims between the pump and
engine block. By moving the pump away from the camshaft in this manner
the pump's lever has a shorter stroke. Apparently this shorter stroke on
the
diaphragm did indeed reduce the pump pressure, and after several additions
of shims, the pump pressure was reduced to approximately 2 or 3 psi. This
modification solved my problem. I must note that I did this in 1991 and the
engine still runs as fine as ever.
Joe Young mvtrucker@aol.com
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