Quote:
Originally Posted by Walt Fricke
Tony - do the standard fittings on the usual pressure gauge systems fit the connection on the return line? I didn't know that.
Since the return to the tank just dumps fuel to atmospheric pressure, shouldn't there be basically zero pressure with the valve open (return flowing)? Do you really need to try to connect up by the fuel tank, with the possibilities of fuel pouring out?
How often is the return line itself clogged? I'm hard put to see just how something big enough to obstruct a line could get into it.
The WUR has a filter on its exit side - a bunch of tiny drilled holes in the casting itself, it looked like. When that got obstructed on my WUR, control pressure equaled system pressure, which was a tip off for sure of a problem.
Easy enough to clean if you disassemble the WUR. Could that be a possible explanation for the quite high control pressure?
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Walt,
The standard CIS pressure fitting is 12-mm x 1.5 and the fittings for the delivery and return lines have 14-mm x 1.5. So you will need an adaptor (12-mm x 1.5/14-mm x 1.5) to connect the CIS pressure gauge kit.
The normal return line will have very low pressure reading and could hardly register on the gauge. But a slightly restricted return line will register something on the gauge. Another restriction also occurs at the WUR’s micro screen filter when the screen gets clogged with dirt or debris.
You need to determine that return line is free flowing before blaming the WUR for excessive control pressure and vise versa.
Tony