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Went back out today to install the revised muffler
(fewer inserts), unfortunately did not get to check it out. After starting
the engine to let it warm up, I hopped out of the cockpit to get my sound
meter. I notice a wet spot below the fire wall on the concrete and killed
the engine. I turned out to be a fuel leak (actually two of
them).
The most serious was a leak in the fuel return line
from the pressure regulator to my header tank which is a low pressure
line. In any case, the fuel was bubbling out between the stainless
steel braid about 2 1/2" above the fitting and dropping straight down to the
cowl (if had been on). Line had been on the engine for 340 running hours
and not in a high heat area.
The other hose from the EFI pumps to the filters
and injectors all appear to be OK, which is interesting in that those are high
pressure areas. I used Earl's hoses for some of the braided steel lines -
but this time decided to use AeroEquip as a replacement.
Second leak is apparently due to a fuel injector
sticking open in that whenever the EFI pumps are turned on there is fuel leaking
from the upper manifold block interface. So I understand Bernie
{:>). Won't know until I take off the manifold but I suspect that is
one of primaries (naturally - as they are hardest to get at).
These are refurbished injectors supposedly cleaned
and flow tested - but, unless you buy new Mazda injectors at $235, you are
getting remanufactured injectors which are getting to be almost 15 years
old in some cases.
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