'86-87 Single-Function Reservoir (SFR) Fuel Flow
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Fuel flows in through the larger tank-side supply nipple from the in-tank pump to the inlet check valve, which allows it into the reservoir. As the cup fills, fuel moves through the filter, up the pickup tube, & out the larger engine-side supply nipple. Unused fuel enters the engine-side return nipple, mingles with any unused fuel coming through the check valve from the reservoir, and exits the tank-side return nipple.
The only fault that would cause a noticeable problem would be for the inlet check valve to stick closed, blocking any fuel from entering the reservoir, but this isn't likely. With the cup removed (have a replacement cup O-ring in-hand before attempting), a sharp pick can be used to pull the valve downward & open. The valve cannot be removed from the reservoir body.
A more common fault (but less noticeable) is for the check valve O-rings to fall out or split, reducing the pressure to the frame pump. This might make the engine slightly harder to start, especially after the tank runs dry.
The Ford engineering number on the filter is E6TZ-9365-A. A reservoir marked "DO NOT REMOVE CUP" does not contain a filter. For a replacement O-ring for the cup, buy a NAPA 3268, Fram CG3862, or equivalent filter.
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