Need a source for a fuel pressure gauge inline adapter.

[wtd]

I'm trying to test the fuel pressure and check for fuel pressure bleed down on this 99 Cavalier that we just bought. I have a Mac 1100MS master fuel pressure kit. The car has 3/8" fuel line and the adapter in the kit for 3/8 only has it on the metal side of the adapter. The plastic quick connect end is smaller and won't fit on the barb on the fuel rail where the line from the tank attaches. Nothing else in the kit will work.

This is what the adapter looks like that is in my kit. I cannot find any information anywhere that tells me if any of these type adapters are 3/8 on both ends.
https://www.amazon.com/OTC-OTC51852...0dd17af62e58e048653f961&qid=1754338967&sr=8-1

 

[GSCJR]

It's been a while, does it not have the typical GM MPFI schrader valve for testing pressure?

 

[Trav]

Is it the 2.2 or 2.4?

 

[wtd]

It's been a while, does it not have the typical GM MPFI schrader valve for testing pressure?

No.

 

[wtd]

Is it the 2.2 or 2.4?

2.2L

 

[Timmastertech]

I built my own. My fuel pressure test kit has an inline adapter with hose barbs on each end and a 1/4 inch flare (standard GM fuel pressure test fitting) in the middle. I use fuel injection hose (not fuel line hose, injection hose is rated to higher pressure) and nylon fuel line repair fittings from the parts store to adapt to the factory unions.