I think your pump has a small crack in its diaphragm and or the check valve is pitted and leaking.
That would certainly allow the pressure to bleed down once the motor is not running.
That pump is spec’ed for 6 psi and you are only reading 5.5, which further supporting the notion that the pump has a issue.
Also that Carter pump only has 1/4” nPT fittings .
On the suction side that’s not much of a issue, but on the outlet side when you look at how the ass end of a 1/4” pipe gets necked down to make the threaded portion it’s a definitive restriction.
Not that I am saying that’s your issue, but I think that you plane and simple need a new pump so look into one that has inlet and outlet ports bigger then 1/4”
pipe.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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