Your description of what it does sounds like the Sierra pump we 1st used on the Johnson tried on my '84...wound up swappin' it out for a real factory replacement which solved the problem instantly...no more off brand pumps for me...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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