Check the gauge on a lawnmower motor or other four stroke engine. To test fuel injected engines without a fuel pressure gauge, I pour a little fuel down the throttle body. I mean a little. An engine will run 1-3 seconds with a little bit a fuel. It's a quick way I use to eliminate ignition problems on a FI engine. Especially if I don't have tools. Or the vehicle does not have electronic signals for fuel pressure.

When the TB is hard to reach, an emission hose works too. A little fuel down the emissions hose going into the intake works. I've used it on Tundra trucks with no fuel test port.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)