1985 Bayliner 85hp Force fuel Issue

JEV007

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Hello Everyone,

I am new to the Forum and alittle new to boating... I just recently bought a 1985 Bayliner 1600 that has a 85hp force engine on it. I am having what I beleave to be a fuel pump issue??? When I bought the boat I seen it run on the trailer with a garden hose. when I went to put it on the water I could not even get it to start. I am slightly motor savey so I pulled the carbs apart and they looked good(the guy I bought the boat from said he just had had them all re-done) took it to the lake for another try with no luck, I started investagating the fuel system, I was able to get the engine to start on starting fluid so I looked at the fuel delivery system. Installed all new fuel lines from the carbs to the tank and a primer blub. I was able to get it running in the driveway with the garden hose, but still ran rough. took it to the lake it would go run good at half throttle for about 15 sec. then it would stall out, I would go back and pump the primer blub and get it to run good agian,but would stall in about 15 sec. I talked with the local boat dealer they stated they would replace the diaphragm and gasket. so I did ran great in the driveway took it to the lake ran great for about 5 hours in two diffrent lakes. went to take it out the next day and agian the same problem returned... I can pump the primer blub and runs great for about 15 sec. I thought it could be the old metal gas cans so I picked up a plastic one but still no luck. so at this point it will idle good in the driveway and in the lake but will only run for a short time at any open throttle position in the lake..... Any help would be greatly appreciated! I am about at my wits end... Ran great one day and don't the next UGH!!!
 

jerryjerry05

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Re: 1985 Bayliner 85hp Force fuel Issue

Basics.Compression/spark/fuel.Do a compression test.Then a spark test.
Then check the fuel system.Check for water,fuel pump diaphram.Ethanol is messing with older lines.
I have siphon hose that I let it touch gas with ethanol it swells and clogs the line.
Do the tests and post your results.Fill out the profile,you might be close to someone who can help.J
 

Frank Acampora

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Re: 1985 Bayliner 85hp Force fuel Issue

NEVER take anything for granted. When buying a used engine--any used engine--assume that nothing is set at factory specs.

At this point check the complete fuel system right from tank to carbs. Do not forget the quick-connect fittings if it has them. The male one can get clogged. Remove the carbs and re-clean them. Then reset the float level and float drop to specs.

Then search for and read my post on synchronizing carbs and timing. Do not run the engine until you read it.
 

JEV007

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Re: 1985 Bayliner 85hp Force fuel Issue

Thanks for the info guys.. I do not have a compression tester, I will try to locate one and update. as far as the fuel system, I have replaced the following: fuel tank, tank/hose disconnect, tank to fuel pump hose, primer blub, diaphragm and gasket, fuel line from the fuel pump to all carbs. this is also a new tank of gas. I will look at some of the other options you have talked about and see where that goes. Thanks agian for all the help
 

JEV007

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Re: 1985 Bayliner 85hp Force fuel Issue

Update:

compression test as follows:

Top cylinder: 132psi

Mid cylinder: 140psi

Bottom cylinder: 130psi

plugs looked alittle dark when I pulled them so I am thinking new plugs are an order.


still have a spark test to do but not to sure where to head from here.


as a side note I also talked with the marine tech that just recently worked on the boat... he stated that he just rebuilt all the carbs, set them and sync them.

I have looked at them myself they looked clean..


any more thoughts??????
 

JEV007

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Re: 1985 Bayliner 85hp Force fuel Issue

dose anyone have a plug recommendation for this motor?
 

jerryjerry05

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Re: 1985 Bayliner 85hp Force fuel Issue

Stock is Champion UL-18V I used them in my motors.In fact they are easy to clean and re-use.
I had some last for 10 years.Then I changed them.They were still good even then.J
 

JEV007

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Re: 1985 Bayliner 85hp Force fuel Issue

Another Update:

Comfirmed that my problem is the fuel pump. I think I am going to replace the diaphragm again. dose anyone know what the fuel pump valve dose??? I think I need to replace that???

Thanks for the help
 

jerryjerry05

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Re: 1985 Bayliner 85hp Force fuel Issue

It stops it from going back into the tank.If you can find them replace them.
The diaphram can go bad if the motor backfires 1 time.J
 

JEV007

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Re: 1985 Bayliner 85hp Force fuel Issue

Thanks for all the Help Jerry
 
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