There is no tap on the fuel rail it must be done at the engine connection using this special tap hose kit (below) this comes in most fuel pressure gauge sets which you can rent for free from the auto parts store.
Here is a guide to give you an idea of what you are in for when doing the job.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Fuel System Pressure 400 kPa ±34 kPa (58 psi ±5 psi)
(Check the adaptors below)
Please let us know what happens.
Cheers
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Tuesday, August 9th, 2011 AT 4:09 PM