Recent content by beckoning

  1. beckoning

    Electric fuel pump on oil injection Mercury

    I searched other posts and found no hits. My 1988 100hp Mercury oil injection motor is a gem. I rebuilt the mechanical fuel pump (twice, following the directions to the T), and don't trust the rebuild. A new or reconditioned (China?) one is $$$. To solve what seems to be a fuel supply...
  2. beckoning

    Leak in aluminum boat

    Did you spray inside and outside? What results do you think you would get with spray or applying sealant outside only? The rivets and seams on my boat are NOT accessible from inside without taking the whole boat apart.
  3. beckoning

    Leak Repair: GluVit, 3M5200, G/Flex650

    I apologize for posting this here and Tinboats.net. My TinBoats post didn't show up, so I'm hoping to get answers here. I need replies from those with experience sealing leaks in riveted aluminum 20' boat. My 20' SeaNymph Great Lakes Special sits on a hoist behind our house until I motor out...
  4. beckoning

    100hp falters

    Seems you may be correct. Where is the anti-siphon valve?
  5. beckoning

    100hp falters

    - Where is the unit-siphon valve? - Fuel line has been 5/16 for years. Fuel filters are SeaWay(?) marine grade -- visually gas flows freely while running. Which is what you call the "fuel pickup pipe?" Is that the tube in the tank? Mine is accessible only if I remove the flooring cover...
  6. beckoning

    100hp falters

    This is not a test. My need is real. My 100hp runs great at 3500-4000 rpm for 20-30 seconds, then begins to falter. I don't adjust the throttle and squeeze the bulb 3-4 times and the motor revives for 15 seconds, then the cycle repeats...falter, squeeze, run, falter, squeeze, run.... I -...
  7. beckoning

    100hp falters

    I have some spare new, black, marine grade fuel line, and that's any easy swap. Any ideas on how to check the fuel tank pickup other than removing the floor? I used compressed air to blow back into the fuel tank, and there must be a check valve because I couldn't blow back, even with...
  8. beckoning

    100hp falters

    I understand that is how the fuel pump works, sort of a push-pull on the 2 diaphragms in the fuel pump. However if the compression test is good ( about 120 all around as I recall from last Spring) how else could crankcase pressure fall?
  9. beckoning

    100hp falters

    This is helpful. Sorry for the long reply, but I'm trying to narrow thing down. Yes, it would seem there is either an air leak somewhere, or something is blocked. Where is the anti-siphon valve? My 18 gallon tank is under the floorboards that are screwed down to hull braces, and the...
  10. beckoning

    100hp falters

  11. beckoning

    100hp falters

    This will take some explaining. '88, Mercury 100hp, 4 cyl, oil injection. Motor starts, warms up in the hoist at 1000rpm, move out to big water through the channel (4 minutes) at 1200rpm, open to 3000rpm in open water. Within 30-40 seconds rpms drop, motor falters, acts like it's running on...
  12. beckoning

    Fuel Pump check valve

    I rebuilt the fuel pump on my 1988 100hp 4cyl, oil injection. When I tried to blow through the small tube marked "in", it would click every time I blew into it. I probed into the opening and the probe stopped halfway to the inlet into the pump mechanism. Is there a check valve on the "in"...
  13. beckoning

    9.9hp water in crankcase oil

    Please elaborate.....bad thermostat?
  14. beckoning

    9.9hp water in crankcase oil

    Besides a leaking head gasket, what could be the source of water getting into the crankcase oil? Drained the crankcase this fall, and milky oil came out. 😵‍💫 Besides a bad head gasket, what else could be the cause?
  15. beckoning

    '89 100hp Merc 4cyl oil injection-runs on 2 cylinders

    This motor is a wonderful, wonderful motor that has given me years and years of superb service. Now, she sputters and refuses to run on 4 cylinders. She starts and will keep running but at 2000rpm, but at 2000rpm+, cylinders #3 and #4 don't kick in as they should. She runs very rough. She...
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