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Old 07-02-2021, 02:01 PM   #11
old911doc
Registered User
The simplest explanation is that there is air in the fuel line. It got in there when the fuel pump was changed. The Schrader ( not Presta, like on bicycles) valve on the fuel rail is there for the purpose of purging air from the system, and to attach a fuel pressure gauge ( many of which have bleeder valves like tire pressure gauges). The cap is the same thread as a tire valve cap, 4/$1.
Press the Shrader valve pin down while an assistant turns the ignition key from off to on; several repetitions may be needed. When fuel sprays out, release the valve. The engine should start.
Depending on whether the car is on level ground, you may not get all the air out at first try.
If the fuel system is delivering fuel under pressure, there is some other cause. Ignition failure would be next. An easy way to test would be to remove one coil from one plug ( two small bolts, 5mm Allen wrench) and stick another spark plug in it and hold it against the engine to ground it while your assistant turns the ignition key to Start. You should see the plug spark; if not, consider crank position sensor failure.
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