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- #21
I replaced the fuel pump because I thought it had a bad check valve in the pump itself...I couldn't find out for sure if there is a check valve in the pump, but I thought I'd give it a shot not being too expensive or difficult to install. Turning the key to "prime" has not worked in the past...I guess Toyotas are unique in that respect.If the car always ran fine under load and didn't have fuel delivery issues (misfire) while running, the fuel pump was fine. When a pressure regulator leaks, it can bleed off the fuel left in the fuel rail while the car sits and then the pump has to work longer to re-prime the fuel rail on startup.
Normal operation of a regulator sends excessive pressure at the fuel rail back to the tank in a return line while the car runs, you just don't want it leaking fuel back to the tank while the car sits.
You could always just turn the key on for a couple seconds to prime, turn it off, and then on and crank. That will give it that little extra prime it needs.