The pump flow control canister and plunger valve wear, allowing the plunger valve to stick open and/or leakage to occur. The canister o-ring relaxes and pressure bleeds past it.
Correction
This drop-in-place assembly includes a harder canister with more support for the plunger valve, which prevents sticking. The assembly also includes a case-hardened plunger valve with self-centering annular groves, a replacement spring, and larger O-ring for improved sealing.
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