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  1. D

    Black Scorpion Mag Mpi fuel pressure

    Replacing the fuel pickup and anti siphon resolved the issue. Fuel pressure is steady at 27psi
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    Black Scorpion Mag Mpi fuel pressure

    I checked the low pressure pump and it was very clean. I plan on replacing the anti siphon valve as well. I will be sure to report back
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    Black Scorpion Mag Mpi fuel pressure

    fuel pickup tube in gas tank
  4. D

    Black Scorpion Mag Mpi fuel pressure

    Well I found the culprit. Suprised it even ran. Hard chunk of of something plastic/glue and varnish
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    Black Scorpion Mag Mpi fuel pressure

    No fuel in oil or leaks. I should remove the hp pump and regulator to take a look.
  6. D

    Black Scorpion Mag Mpi fuel pressure

    Can this be tested? Or do I just replace it?
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    Black Scorpion Mag Mpi fuel pressure

    Its a fuel related issue, my pressure would slowly creep down after a couple minutes and started to run lean around 15psi. Opening the gas cap did not help. I ran off the an auxiliary tank plumbed into the low pressure fuel pump and did not give me an issues until I ran out of fuel. It was only...
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    Black Scorpion Mag Mpi fuel pressure

    26 psi with vacuum attached and 32 with vacuum line disconnected
  9. D

    Black Scorpion Mag Mpi fuel pressure

    Is there a way to diagnose if it the pump or regulator?
  10. D

    Black Scorpion Mag Mpi fuel pressure

    2004 scorpion mag mpi SN 0M393328. Is the regulator spec the 34-38 or 30psi what is show on a bracket over the regulator?
  11. D

    Black Scorpion Mag Mpi fuel pressure

    According the 24 service manual I am supposed to be getting 34-38 psi. Is that at idle with regulator vacuum connected? I'm getting 26psi at idle with regulator vacuum hooked up. If i disconnect the vacuum should it increase? I'm to determine if I have a fuel or regulator issue. After a few...
  12. D

    3.0L Mercruiser does not always return to idle

    Did you ever figure out the issue?
  13. D

    3.0L TKS stuck in base timing

    the interrupt switch is hooked up properly. purple wire going to one of the black leads and the white with green stripe going to the other black lead.
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    3.0L TKS stuck in base timing

    nope stayed in base timing mode
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    3.0L TKS stuck in base timing

    I was checking base timing by starting engine and bringing up to operating temp then jumper the 2 white dist wires together and bypass the shift interrupt wires. After timing was set I reconnected shift interrupt wire and removed jumper from distributor. The engine would not come out of base...
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    3.0L hard starting when warm

    Test with a positive lead on one of the leads and the other grounded to the block? I found out my thermostat was partially stuck up which would explain why the engine temp never got hot enough to provide the ground from the TKS temp sensor.
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    3.0L hard starting when warm

    Got got to mention I tested the tks temp switch in hot water and it closed the circuit at 135F
  18. D

    3.0L hard starting when warm

    If I put a jumper wire on the tks temp sensor input into the harness I get 12 volts to the tks module. Maybe my thermostat is stuck open? It’s a bear cat to restart when warm. I replaced my temp sensor for the gauge and it just reads 175
  19. D

    3.0L hard starting when warm

    I replaced the tks temp switch and still don’t get 12 volts to the tks when engine is warm. I’m at a loss😠
  20. D

    3.0L hard starting when warm

    Which seems weird because when you start a engine cold <90F you would want it to remain open so you are not sending voltage to the Tks module
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