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New miata owner here. I'll post on the intro section when I upload a few pictures of the car.
What is the factory fuel pressure with the vacumm line off? I tried searching for this but came up short. Most of the info I found was for newer miatas with returnless systems.
TIA
As I recall, for the 90-93, fuel pressure should be around 35 psi at idle, and it should jump up about 10 psi when you remove the vacuum hose from the factory FPR. I do not know if the same applies to the 94-97.
Welcome to the forums.
From the 1.8 Enthusiast's Shop Manual...
After depressuring system, turn ignition on for 10 sec., the system should hold at least 21 psi.
Max pressure 64-85 psi
Idle pressure 32-38 psi for '94-'96 models and 29-35 psi for '97 models
disconnect the vacuum hose and pressure should rise to around 41 psi.
Hopefully that answered your question but in the future knowing whether you have a 90-93 or a 94-97 makes a difference in people being able to help you. In general the more info you can provide the better people will be prepared to help you.
Sorry, my car is a 90.
That definitely anwered my question. Thanks.