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MSM MSPNP Pro Stock Injectors Leaning out @ 9psi. Stock ECU Fine

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Old 09-02-2019, 12:56 AM
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Originally Posted by curly
So your voltage correction is wrong? You may want to check that.
No, it was correct. The fuel pump was weak requiring higher voltage to maintain pressure.
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Old 09-02-2019, 01:02 AM
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Update and resolution.

Replaced the fuel pump and Im now able to tune afrs for the 11s all the way to redline at <90% DC @ 10.5psi. Problem was a weak fuel pump. I put in a DW200. Thanks for everyone's help!
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Old 09-02-2019, 11:31 PM
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Originally Posted by 18psi
its probably losing fuel pressure
Originally Posted by rhombus
Update and resolution.

Replaced the fuel pump and Im now able to tune afrs for the 11s all the way to redline at <90% DC @ 10.5psi. Problem was a weak fuel pump. I put in a DW200. Thanks for everyone's help!

I'm starting to see more and more weak/dead pumps these days. I'm guessing age is finally catching up to these cars
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Old 09-03-2019, 11:19 AM
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Originally Posted by 18psi

I'm starting to see more and more weak/dead pumps these days. I'm guessing age is finally catching up to these cars
And you were correct. It was also interesting to me the compounding issue with improper MS3 Pro alternator output voltage setting.
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