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Also, the black oil may be unburnt fuel/oil mixed with exhaust/carbon. Need to check the basics... spark test, compression test, and Fuel Quality/Delivery tests.

Rebuild kit. This is quite possibly the problem- and SHOULD HAVE BEEN DONE WHEN YOU REPLACED LINES, BULB AND FILTER. You've likely still got debris being distributed from A to B to D to (oh...

This is essentially a duplicate of your other ongoing thread. Let's stick to that one thread rather than opening multiple ones that each require responses. Thanks! :beers:

One of the more common causes would be the driveshaft seal carrier seals or o-ring.

Just so you're prepared.... Your warranty ended in May, 2023. You have a Service Contract (GOLD Product...

:thumb up2:

Most commonly the boat is rigged at the factory for all engine/instrumentation features. Apparently they didn't know the difference or completely missed the difference.

If you can get your VVL...

Hate to hear you're down. Try your best to keep to one engine/poster per thread to help avoid confusion (I know you didn't intend to hi-jack the thread).

Leon- I've had just one engine that did what you're describing. Subsequently performed wide-range of tests on direct and fuel injectors and eventually found one (1) fuel injector that would...

Now just to determine if it's the ECU shutting down to protect itself, a fuel restriction, or a pump failing.

-Monitor voltage at the battery while this is occurring. Suggest a DVOM wired where...

Most don't. If you want to buy stuff there that's your prerogative, but THEY should provide you with technical support for what you purchase.

The Optimax from that vintage uses a simple analog...

Thanks for the heads-up, appears the server was down. Should be back up now.

Follow the harnesses connected to the lower-2 ports on the Junction Box. The top one is connected to the Can-P Gateway Stick.

Note: If you have a VVL, there's no reason for you to have a Can-P...

Moving your post to the 3L Forum- be sure to update with the Engine Serial Number as it's required.

What screen and which fuel pump did the "mechanic" tell you to replace? Probably better off if...

You can use Power Trim & Steering Fluid, or Dextron-type ATF.

There is also no spec for this "test". Battery drains are measured in Amps Mah, not ohms.

Moving this to the 3L Forum, based on your signature.

Make sure the cap isn't cracked, and that the black w/blue stripe hose (oil line) coming from the remote oil tank isn't disconnected/broken/cut, etc.

Not necessarily. 13.4 is fine... and Smartcraft reports the LOWER of MPR voltage or PCM Wake voltage.

I do agree that if you have evidence of a voltage problem with ANYTHING that's on the same...

Check the throttle roller for flat-spots. Was fairly common back in that time period.

Also be good to know if they used OEM diaphragms or Aftermarket. The valves in the aftermarket ones are...

Not the same gearcases. 1B779250 should have a Verado-style gearcase, you COULD use it, they're quite durable (just a tad slower due to geometry)- and they use the standard prop hub (FT-II).

Not...

Might also want to monitor BATTERY VOLTAGE when this is occurring. High voltage can potentially cause ECM shutdown... which would be rather abrupt with virtually no sputtering, engine would restart...

Cleaning is fine as long as it returns fuel pressure back to within spec. If this is the first time you've cleaned it since 2004... don't sweat it and go fishing!

1. Your engine has zero, no, absolutely NONE "Can Circuitry".

2. OMC Gauges are not supported for use on Mercury engines.

Please take a moment to review the Announcements at the top of the...

No way would I be tearing into my "less than 1 year old" 150 Fourstroke to fix an oil leak.

First and foremost: If you're using MERCURY's oil, it contains UV Trace Dye, meaning UV light (and...

I'm going to go out on a limb here and say this is the same boat/instrument/graph/NMEA-2000 situation you posted about in a separate thread. Let's stick to that thread to avoid confusion.

Glad Rhonda was able to get you taken care of.

For future reference, you can also directly order from the website through the Parts Catalog, using your engine serial number. Either will work,...