Welcome Guest - Sign Up today
Welcome Guest - Sign Up today
Store Links Mobile - Shop Now

Announcement

Collapse
1 of 2 < >

SITE MAINTENANCE

The iBoats Forums will be down for maintenance starting at 10 AM MST on 12/16/2017. The estimated amount of downtime is 3 hours (we are expected to be back up at 1:00 PM MST). Thanks for being a part of the iBoats community!
2 of 2 < >

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone else’s topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when it’s posted at the end of someone else’s topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

1990 OMC Cobra 4.3L V6 Mod# 432APRRGD Fuel and electrical problems/questions

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • 1990 OMC Cobra 4.3L V6 Mod# 432APRRGD Fuel and electrical problems/questions

    1990 OMC Cobra 4.3L V6 Mod# 432APRRGD Fuel and electrical problems/questions

    I picked up a 1991 Hurricane deck boat. It has the OMC engine listed above. I am not getting fuel to the carb and have some questions.

    1) First observation is that the float on the carb is not moving but is not stuck. I know is electronic. Looks like a holly 2 barrel that came with the engine originally. What should the voltage be across the solenoid to actuate it?

    2) Would love a wiring diagram that shows how the battery and engine should be wired to all the solenoids for it. Is there a repair manual available I can purchase somewhere that will give me this information? Just want to make sure everything is wired up.

    3) I know the fuel pump is mechanical in nature. I think the part number is 982997???? Other than disconnecting the fuel line is there any other way to check it? I did replace the fuel filter to eliminate it from the problem. All the lines and hoses look good. Just no fuel?

    4) I tried to start the engine by pouring some fuel down the carb but did not even try to crank up. Everything is turning as it should and plugs getting spark but not even a sputter from the fuel I gave it manually. Would the electronic part is the carb effect this? Can their be a problem with the ignition switch that might cause this? How to check both?

    Thanks for taking the time to help.

    Sky

  • #2
    The carb is not electronic. What you are looking at is an electrically heated choke. There are OMC manuals out there on ebay if you look around that will have wiring diagrams. On a boat that age, there are a number of reasons why a fuel system issue would prevent it from starting.
    ​There is a procedure to measure the psi that the fuel pump puts out. In my experience these mechanical fuel pumps rarely go bad, my engine has the original on it still. You may have a clogged anti siphon valve on the gas tank. I'd get a manual and then troubleshoot the whole fuel system.
    1988 Four Winns 200 Horizon
    4.3 OMC Cobra

    98 Jeep Grand Cherokee 4.0 Selectrac
    07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

    "While air doesn't freeze....rust never sleeps"

    Comment


    • #3
      3) I know the fuel pump is mechanical in nature. I think the part number is 982997???? Other than disconnecting the fuel line is there any other way to check it?
      Ayuh,.... Welcome Aboard,.... Hook up a remote fuel tank directly to the fuel pump with known good gas in it,.....

      Comment


      • #4
        Originally posted by Lou C View Post
        The carb is not electronic. What you are looking at is an electrically heated choke. There are OMC manuals out there on ebay if you look around that will have wiring diagrams. On a boat that age, there are a number of reasons why a fuel system issue would prevent it from starting.
        ​There is a procedure to measure the psi that the fuel pump puts out. In my experience these mechanical fuel pumps rarely go bad, my engine has the original on it still. You may have a clogged anti siphon valve on the gas tank. I'd get a manual and then troubleshoot the whole fuel system.
        Thanks for the reply. I took the fuel pump apart last night. The diaphragm is cracked. I will be replacing the entire pump just to be sure it is good. The anti-syphon valve is good. I am hopefull to have the fuel system in good repair after replacing the pump.

        Comment


        • #5
          The battery is draining down just sitting. Is this normal? Also I was trying to crank the boat and the positive cable got hot?

          Comment


          • #6
            Also I was trying to crank the boat and the positive cable got hot?
            Ayuh,.... Clean both ends of the cables,....

            There's corrosion there, as resistance equals heat,....

            'n No, the battery shouldn't go dead without use,...

            Comment


            • #7
              check cabin/nav lights - u can also try amp load method using a digital multimeter inline - disconnect one fuse at a time to see if it drops.. u shd never really swing more than 5-8 seconds at a time with breaks in between, and after 3 minutes max let it sit a while. Make sure each and every connection from/to a battery/starter/engine block has been sanded shiny, even the washers and bolt surfaces. Put on a LOT of di electric grease and reconnect.

              Some batt cables look good but are junk, I had exactly this ssue on a motor swa I did last week - also a 4.3 - the red batt cable looked good but was junk. Replaced it and all good. If u are on salt water forget those junk shiny chrome junk cables from the parts store. Snip them off, buy some heavy duty brass ones and press them one with a big vice/press. Napa might be able to do this. . and grease those too after youre done.

              Comment


              • #8
                Sign up today
                Originally posted by CamaroMan View Post
                check cabin/nav lights - u can also try amp load method using a digital multimeter inline - disconnect one fuse at a time to see if it drops.. u shd never really swing more than 5-8 seconds at a time with breaks in between, and after 3 minutes max let it sit a while. Make sure each and every connection from/to a battery/starter/engine block has been sanded shiny, even the washers and bolt surfaces. Put on a LOT of di electric grease and reconnect.

                Some batt cables look good but are junk, I had exactly this ssue on a motor swa I did last week - also a 4.3 - the red batt cable looked good but was junk. Replaced it and all good. If u are on salt water forget those junk shiny chrome junk cables from the parts store. Snip them off, buy some heavy duty brass ones and press them one with a big vice/press. Napa might be able to do this. . and grease those too after youre done.

                Thank you for the suggestions. I have repaired the boat now. I did get the fuel line purged of air and found the that the ignition coil had gone bad while trying to purge it. Now I will be on the water today after work. I am so thankful for everyone making the suggestions.

                Comment

                Working...
                X