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Detecting
the leak
The initial
leak in the interconnecting pipe between the carburettors was
detected by the higher than usual frequency of pulsing of the
fuel pump when the ignition was switched on. Tightening the
hose clips only made matters worse and the leakage went from
a drip to a stream of fuel so I quickly turned off the ignition.
Replacing the hose
I had purchased two metres of Gates Barricade ¼”
fuel hose (GFH1025X) in anticipation of future requirements
to replace perished hose. Having recently used a section of
this to replace the hose between the carburettors I was surprised
that it was already leaking. On examination the existing hose
appeared in good condition without signs of hardening or perishing
from exposure to E10 fuel. However, the bore was noticeably
oval on both the removed part and the coil of ‘new’
hose. I cut off a narrow section of this and slid it over the
fuel feed pipe of the left carburettor in expectation that the
ovality would disappear when assembled. However, as illustrated
in photo above and to the left the ovality remained with a clear
gap between hose and pipe evident.
I next measured the outside diameter of the pipe which came
to 0.235” which probably explains its inability to remove
ovality from a nominal ¼” (0.250”) bore hose.
Anxious to return the car to a roadworthy condition and unwilling
to risk more oval hose I turned to a short section of braided
hose (GGT101) I had purchased last Autumn. At 2½“
this was over long for this application but was easily shortened
with the aid of a rotary hand tool and cutting disc. |
