Reply With QuoteAs 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.
90-97 Fuel pressure
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.
On the track, I am fearless.
If you were as slow as me, you wouldn't be afraid either.
1994 M Edition
CSP 67
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.
John O.
94R
Sorry, my car is a 90.
That definitely anwered my question. Thanks.
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