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My t100 3zve tries to start but only runs a couple of seconds…

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My t100 3zve tries to start...
My
t100 3zve tries to start but only runs a couple of seconds .have replaced fuel filter,regulator and when checking pressure at fuel rail I had 45 psi when I turned
Key off it dropped immediately I heard it may be fuel damper?
Submitted: 3 years ago.Category: Toyota
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5/23/2015
Toyota Mechanic: Toyota Service, Toyota Expert replied 3 years ago
Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
Satisfied Customers: 5,239
Experience: 30+ Yrs of auto experience, Award Winning Svc. Manager; Just Answer Customer's Choice Award Winner
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Hello. Welcome to Just Answer. Please allow me to assist you.
Nominal fuel pressure should he HELD with the key off. The pressure should not drop to zero. This sounds vey much like the internal check valve in the fuel pump has failed. The pressure should stay around 35-40 on the fuel pressure gauge for at least 4-4 hours.
If the pressure is dropping to zero as soon as you turn the key off, the recommendation would be to replace the fuel pump
If you have any questions, please feel free to reply
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Customer reply replied 3 years ago
Not fuel pump brand new and pressure is holding steady at fuel filter out line
Toyota Mechanic: Toyota Service, Toyota Expert replied 3 years ago
The fuel pump is designed to hold fuel in the fuse system; under pressure, by design when the key is off.
This keeps fuel at the injector rail for the next start.
Your fuel pressure should not drop to zero withe the key off as you have stated earlier, where you stated: and when checking pressure at fuel rail I had 45 psi when I turned Key off it dropped immediately
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Customer reply replied 3 years ago
Please send me something
Toyota Mechanic: Toyota Service, Toyota Expert replied 3 years ago
If this vehicle was in my shop I would be removing the fuel pump and fitting one that held fuel pressure. After that we would see if there were any other issues to tackle.
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Customer reply replied 3 years ago
Pumps fine cheked it at tank and fuel filter out line has to be after that point
Toyota Mechanic: Toyota Service, Toyota Expert replied 3 years ago
If the fuel pump is holding pressure your injectors are bleeding the pressure off. Do you smell raw fuel on restart?
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Customer reply replied 3 years ago
No but I can hear fuel running when ignition is on
Customer reply replied 3 years ago
(Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Toyota Mechanic: Toyota Service, Toyota Expert replied 3 years ago
What year is this t-100?
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Customer reply replied 3 years ago
1993 3zve engine
Toyota Mechanic: Toyota Service, Toyota Expert replied 3 years ago
The fuel pump on this engine should Not run with they key on.
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Customer reply replied 3 years ago
It starts when I turn it over its made to its leaking up top somewhere after ignition is off like I said before it runs a few seconds and quits fuel damper leaking to inside ot injectors?
Toyota Mechanic: Toyota Service, Toyota Expert replied 3 years ago
I would pull one side of the injectors our and observe them. See if they leak fuel after the key is turned off.
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