mark 75 issues

[dave-bernard]

sounds like a restriction.

[jeff-register]

Pull the fitting off the end & try pumping it. Like Dave says It’s moving too slow.

[motoscott909]

Another update. I cant seem to find a restriction anywhere in the line. It seems that the slow pumping problem is in the bulb itself. I wonder if the check valve inside is malfunctioning?

For my own sanity i stripped the fuel pumps completely down once again. I found one issue. under one of the check valves in the bottom pump, the little round gasket must have moved when I put it together, and was half way out of place. The other half had become lodged into the area below the check valve. Im thinking this may have been a big issue. It may as well of not had a check-valve in that side because all the gas could go right through the opening the dislodged gasket created. I replaced the gasket with an extra that i had from when i put the kits in. It seems to run fine, but then again it always does until it decides to quit. I will have to bring it out and run it to see if this fixed the problem.

I still have the issue of the funky primer. I think i’m going to buy another one to see if it helps.

One last thing. (I promise) 😀

What voltage range should the stator be putting out? It seems that at an idle, the battery is actually discharging slightly (down about .2 volts from 12.6 to 12.4), but when I rev the motor a bit the voltage jumps to around 12.8. I’m used to seeing stuff charge around 13.5 volts or so, so im not sure if i have a problem with the charging circuit also?

Thanks again!

[dave-bernard]

sounds OK to me. 12.4 is still charging.

[jeff-register]

Scott,
If you check voltage using the two wires coming off the stater & connect to the rectifier you will get A.C. voltage. Do not disconnect but ground 1 lead from the meter & contact the other to the rectifier lead in post. You have two connections from the stater, check each one separately
Your rectifier may be flakey too. You should always have a slight voltage increase running thru a rectifier or diode. What you have is a bridge rectifier. It has four connections, Two connect to the A.C. voltage in & output is full wave D.C. positive & negative. The third terminal is positive & the ground, mechanical bolt up connection is the 4th connection. Check alternator output on the AC scale & rectifier output test with D.C. scale both on the 50 volt scale for starters.
I’m glad you found a bad pump, Now get a Mercury squeeze bulb to keep a good flow going. Mercury pumps are good as long as the rest of the system is in good shape & no vacuum leaks.
The Mercury charging system has no regulation. For this reason the output is lower so the battery does not over charge & cook itself.

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