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  1. Scott06

    What does HEI / D.U.I. replace

    not sure if that originally had a mechanical or was Gen II engine that came with an electric pump from the factory. the LX from 88-92 used a mechanical pump from factory. The LX 92 and up used an electric pump... Being a cross over year could be either way. the factory wiring for electric fuel...
  2. Scott06

    What does HEI / D.U.I. replace

    what engine are you working on (model preferably serial number)? fuel pump should not be wired straight to key, as if you leave the ignition on by mistake fuel pump will be running
  3. Scott06

    What does HEI / D.U.I. replace

    good catch - run a 12 v jumper to coil see if the issue goes away.
  4. Scott06

    2002 5,7 Mercruiser exhaust manifold keeps cracking - 5 times this summer

    Have you put a section of clear hose in water into engine line to look for bubbles ?
  5. Scott06

    What does HEI / D.U.I. replace

    Yes the DUI has the coil in the dist cap top and the module is inside the dist. DUI is based off GMs HEI that is similar all in one dist another way to do is the Delco EST. The Est is more common In marine applications and is used as OEM on some mercruiser and volvo penta engines. Main diff is...
  6. Scott06

    Mercruiser 7.4 Carburetor 9777s needs repair kit

    I think yes but might be worth a email to edlebrock to confirm.
  7. Scott06

    Mercruiser 7.4 Carburetor 9777s needs repair kit

    Also can go to mikes carb parts for a kit floats etc
  8. Scott06

    Should I redo the pink RV antifreeze that I already used last week to winterize Merc 5.0?

    Raw water hose on yours is the 1.25” diameter hose that comes along the intake to the rh side of thermostat housing. If you follow it back behind the distributor the ps cooler is on the back of the block/ flywheel cover . mine never holds water what i do is pull the hose off the thermostat...
  9. Scott06

    I got a boat...help needed!

    First what are you working on year and engine or better yet serial number off the engine. Did you test the boat out before you bought it? You need to determine if you are getting spark, getting gas, and have compression. Do a compression test before you waste a bunch of time trying other...
  10. Scott06

    Mercury Demand, Demand Linear, Demand Guardian

    That is pretty impressive. Does it alter the trim based on conditions that day or what it was set to for WOT?
  11. Scott06

    I/O (Sterndrive) Conversion to Outboards

    Your brothers old boat had the 4.5/250 hp correct ? How did that do in a 20-21 ft boat . My current boat is 21 ft with a 5.0 with 4 bbl edlebrock on paper 260 hp… like the size but when I have 8 ppl one of which is one the rope wondering if 4.5/250 hp cuts it
  12. Scott06

    I/O (Sterndrive) Conversion to Outboards

    Never bought one either for the same reason, just using it as an indicator of reapair costs
  13. Scott06

    I/O (Sterndrive) Conversion to Outboards

    on larger boat like yours I could give up swim deck space because there is more seating/lounging area. On a 21 ft the swim deck is prime real estate. All of it is a far cry from the old days - I remember stepping on the outdrive to get back in out neighbors boat (1969 Starcraft IO- 18 ft) didnt...
  14. Scott06

    I/O (Sterndrive) Conversion to Outboards

    Much smaller boats that I have had, but I have been very happy with the two Sea Rays we have had over the last 30 years- 1991 170 BR, and currently 2004 200 sport. On the 04 I had the first non-human stupidity induced fabric tears on back bench. Gel coat still looks good with occasional buff and...
  15. Scott06

    3.0l not accelerating/boggy

    Would second running it w the OD off you can jam a hose in the water port on the bellhousing. Also post a video to youtube etc and link it here. Hard to tell from the keyboard what the noise is.
  16. Scott06

    2006 SeaRay 195 Sport not accelerating/boggy

    in additon the crab style distributor caps on MPIs will give a missfire. cheap thing to rule out. What do the spark plugs look like
  17. Scott06

    MerCruiser 5.7 inboard gas engines not used in years – what to do

    First check to see if there is oil in them. I would take the plugs out, squirt some oil in cylinders. If so put a battery in and bump the starter see if they turn freely. If not locked up - See if you can suck the oil out. add fresh oil and change filter. Would run them with plugs out and coil...
  18. Scott06

    Outdrive failure?

    most likely. they tend to last the lifetime if alignment is ok. Alignment can be off from sagging engine mounts , gimbal, bearing going bad or rotten stringers and transom. Would think the bang would be more indicative of drive exploding but could be splines on coupler too. Take a look and see...
  19. Scott06

    winterizing question

    From two different people on this site you will get three different answers. Some leave PG antifreeze with corrosion inhibitors in there to prevent corrosion of water jacket. Others like my self (upstate NY) just drain it and be done with it. I do chase the hoses with a little AF to get any...
  20. Scott06

    Mercruiser 3.0

    yes negative goes from neg battery post to flywheel cover on back of block . It is equally important to check and clean negative cables as positive cables ...
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