Fuel pressure gauge adapter not fitting on schrader valve
 

I have a fuel pressure gauge with multiple adapters of which none will fit on the schrader valve on the m54b30 fuel rail in the e53. It does work on what appears to be the same fuel rail on the m54b30 in my e46.

Anyone know what particular size fuel pressure qauge adapter fitting is needed?

Not sure what the size is, but after buying a "universal" pressure gauge set that none of the fittings fit my fuel rail Schrader valve, I bought one that would specifically work with the M54. It is a smaller than normal valve.

Where did you buy it? Do you have a link for it?

Amazon

This one: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Thanks.

I have one similar to that with the same fitting. Too big.

Mine came with two fittings. One was small and fit.

https://bmwrepairguide.com/fuel-pres...ycle%20tire%29.

Plus all the testers and adapters you will ever require
https://www.amazon.com/s?k=fuel+pres...f=nb_sb_noss_1

I may need to snag another fuel rail out of the junk yard. Can't find anything to fit on the valve. My adapter fits on my other m54b30 rail just fine.