Quote:
Originally Posted by Father Of Giants
Just ordered lift pump rebuild kit and a NEW overflow valve, we'll what comes of it.
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Be aware that the 60x engines use a drilled-orifice style overflow valve. The orifice size determines pressure in the fuel rack, not spring pressure. The check valve with extremely weak spring is only there to prevent air ingress after shutdown. Changing the overflow valve will do nothing for pressure in the fuel rack.