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  1. Serf27

    OMC 3.8l dying at high rpm and weird cranking issue.

    Its about 170°-180°. The factory thermostat is 160°. Thanks for the 5 minute rule. I only ran it for about a minute with engine cover open. Will keep it on while in the no wake zones. I was thinking that dual batteries = more power to crank the engine faster and over power the back pressure...
  2. Serf27

    OMC 3.8l dying at high rpm and weird cranking issue.

    So it’s not vapor lock then. The fuel line is wrapped around the rear of the engine and engine temps are 180°F. Should I be running with the bilge air vent fan turned on? Possibly back pressure, but wouldn’t all boats have this issue? How could I correct it? Running dual batteries?
  3. Serf27

    OMC Stringer ESA not working-Adapter housing not centering.

    Excellent, thank you for confirming. All these issue getting figured 1 by 1! One last question. The over stroke switch is supposed to Disable the ESA while in gear. So on the water, as soon as I move the shift Cable towards neutral(while in gear) the ESA switch should be depressed and as...
  4. Serf27

    OMC Stringer ESA not working-Adapter housing not centering.

    Here is a video I took of it. The main issue was the 4 pin male connector not making contact, even with the little retainer. I pushed the wires in as tight as I could. If it keeps losing contact, I will hard wire this connector. I also relocated the module, the stock location makes the module a...
  5. Serf27

    OMC 3.8l dying at high rpm and weird cranking issue.

    I sucked on the valve from where the line to the tank goes. I couldn’t get any air flow until I pushed on the spring. But the pump may create more vacuum and open the valve? Or should the valve open with light vacuum? A closer look at the valve, shows the orange stuff is in the spring too...
  6. Serf27

    OMC 3.8l dying at high rpm and weird cranking issue.

    Here is my tank. I blew air into the tank through the breather vent on top and fuel came out of the tank. So is the breather good? Since it has air flow? I took the fuel fitting off, the one that sends fuel to the pump. There is no long rod that comes out. The pick up tube looks welded in. The...
  7. Serf27

    OMC Stringer ESA not working-Adapter housing not centering.

    I pulled the ESA module off. I connected it back just to make sure it was bad. I wired the ground wire from the ESA to an engine bracket, move the ESA V Cam and TA-DA. Engine rpm dropped. Released ESA switch and rpm rises. Since it’s just a ring terminal the ground wire, I can wire the ground...
  8. Serf27

    OMC Stringer ESA not working-Adapter housing not centering.

    Yea I’ve tested the switches and adjusted the over stroke switch per manual instructions. Ohmmeter says they’re working as the manual says. I lowered the idle to 600 rpm and the switches don’t drop the idle down any further. The ESA mounting bolts are receiving 12v too. Guess the module is bad...
  9. Serf27

    OMC 3.8l dying at high rpm and weird cranking issue.

    I will remove the tank and check out the pick up tube. Flow from main line seems to be unrestricted though because I pumped old fuel out a few weeks ago and it flowed out easily.
  10. Serf27

    OMC Stringer ESA not working-Adapter housing not centering.

    Yes I have tested continuity on the switch and have cleaned the wiring connections. Tapping or holding the switch does nothing.
  11. Serf27

    OMC 3.8l dying at high rpm and weird cranking issue.

    Thanks again. While the “new main line” from tank to pump hasn’t been ran on the water, it is still 2-3. I will try running it on an external tank or just replace the main line entirely. I pulled the top half of the carb off and it looked clean, the float needle valve was in good condition...
  12. Serf27

    OMC Stringer ESA not working-Adapter housing not centering.

    Thank you for the reply. I am not sure about the distributor. It looks original with what appears a ground wire going to it. I think from the ESA as I’ve read it sends ground impulses to cut the power. Yes, I tested each switch. The over stroke switch and the ESA switch. I believe the over...
  13. Serf27

    OMC Stringer ESA not working-Adapter housing not centering.

    I have diagnosed and tested all cables and done all cable and shift adapter housing adjustments. I measured drag/resistance on main shift cables with a fish scale. Both were under 2.5lb. I set the over stroke switch per the manual. Start engine Rotate shift arm until in full reverse...
  14. Serf27

    OMC 3.8l dying at high rpm and weird cranking issue.

    I’ve just looked at the specifications in the manual and it is saying the 3.8l compression pressure is 125 psi. Either the tester I used was defective, excess fuel is getting into the cylinders during cranking or something mechanical is off. This cranking issue is random. Sometimes it cranks...
  15. Serf27

    OMC 3.8l dying at high rpm and weird cranking issue.

    Hey all. I’ve asked for help here with great success from most of you, but I can’t catch a break on this 4yr project. 3.8l OMC V6 2barrel carb. Old fuel completely drained New main fuel line from tank to pump. New fuel water separator and new fuel filter. First, the cranking issue: The old...
  16. Serf27

    Best propeller pitch for Frankenstein build.

    Somewhat successful day today. Took it out with the new prop and the new 800 lower case. The new prop, only 2 pitches larger than the 15 pitch was much larger in overall dimensions. I was moving a lot faster at 2K rpm than with the old set up. I took it up to 3500-3800 and I was really...
  17. Serf27

    Best propeller pitch for Frankenstein build.

    i have not looked at the fuel vent. That did also cross my mind but I never checked it out. I was able to pump fuel out of the tank relatively easily though from the main line that goes to the pump. I felt no restrictions there when pumping old fuel out. It flowed in a steady stream. There is a...
  18. Serf27

    Best propeller pitch for Frankenstein build.

    I drained all the old fuel out of the tank last week. First there was some water/fuel mixture and orange fuel followed it. About 7 gallons. I replaced the main fuel line from tank to the water separator and replaced the separator too. All cyl compression is at 150. The carb is the last thing...
  19. Serf27

    Best propeller pitch for Frankenstein build.

    Perfect. I will try it out and post results. Thank you.
  20. Serf27

    Best propeller pitch for Frankenstein build.

    Thank you for the chart. I did not get to WOT last week with the old set up. All I got was 4k rpm on a 15 pitch prop, but the throttle lever still had room to move forward. If I’m reading these other threads correctly, the max rpm for the complete 400drive/4cylinder is also 4600 rpm. The...
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