GT150 Problems

[wtp]

Been reading these forums for a few days and got some mixed feelings on some of my problems. I have a 1986 GT150 on a hydra sport. When I bought the boat of coarse the guy said it ran good. Well finally got it out and couldn't got more than 24 mph out of it and every time you stop you have to reprime and hurry up and restart it before it loses prime. Long story short got it home and found cracked gas lines. Replaced all lines and primer ball. Checked pickup tube and was fine. opened carbs up and blew through all jets with compressed air. Took it out again and samething. nothing more than 24mph not sure on rpms tac don't work. got it home and checked compression. 91-92-91 on starter side the other side had 100-99-100 from what I read it's with in specs. Put new plugs in since had them out. Took carbs off again looked a little closer at them but seem fine. not sure if it makes a difference or not but I'm preety sure I got them right but might have carb 1 and 3 switched around. Don't think so though. Now looked at fuel pump (VRO was compltely removed by somebody else) diaphram was questionable. possiable leakes by screw holes. and some of the plastic seems to be cracked. took my fuel pump off my 50hp force that I know was good. took it out again and now your lucky to go 5 to 10mph and thats if i keep reaching back and priming the bulb. I could be wrong but I thought any vacuum ran pump would work. I guess I was wrong. Any ideas what I can try or do.

New fuel lines
new primer ball
checked pickup tube in tank - was fine
checked compression - good
new plugs
no VRO pump
diffrent fuel pump - pump good off force 50hp
carbs are clean - seem to be
batteries are new
charging system working 14v while driving

 

[piperdriver]

Re: GT150 Problems

The 150 HP. engines require a lot of fuel. They ran 2 fuel pumps prior to going to the VRO system. If you go to evinrude.com and look at the parts catalog for a 1983 150 HP model, you will find the 2 fuel pump setup. You have two options--Replace the pump with the correct VRO pump for your engine, or Dis-able the VRO system and purchase the 2 pump set-up. Do not continue to run the motor in a lean condition. The problem does sound like it is a fuel pump.

 

[wtp]

Re: GT150 Problems

Thank you for the reply. Is there a option for cheaper pumps other than the ones they have?

 

[piperdriver]

Re: GT150 Problems

I will give MY opinion. I am a STRONG believer in supporting your local businesses. It has been my experiance that the local dealers are usally cheaper than the prices you see on the Evinrude sight. I just gave $75 for each pump from my local boat shop. It works good for me to go to the Evinrude parts sight to do my research and when I talk to the local boat shop, I can give part numbers that I am looking for. Now keep in mind that the local dealer might know updated information that you may not get from the website. If you wanted to go with the VRO pump be ready to spend $400+. The dual pump setup IS the most economical.

 

[wtp]

Re: GT150 Problems

I looked at the picture but not a 100% positive on the hook up of 2 pumps. I only have 1 that I can see for the crankcase pulse. Do I "T" them and do you run 1 fuel output to the fuel input on the other pump? Thanks againfor the help. Little green on this stuff but am learning

 

[piperdriver]

Re: GT150 Problems

You will hook up the the fuel inlet hose to the upper pump "fuel in". From the "fuel out" of the upper pump to the "fuel in" of the lower pump. The "fuel out" of the lower pump to the fuel rail that feeds the carbs. Put them in series of you will. Each pump needs it's own pulse signal. I am pretty sure that your motor has two pulse ports. Look closely to make sure that one of the pulse ports is not plugged or capped.

 

[wtp]

Re: GT150 Problems

Thank you very much for your help. I ordered a upper and lower pump today and new carb kits. Do you know if it makes a differnce between carb 1 and 3 if they might have got switched around?

 

[piperdriver]

Re: GT150 Problems

I'm sorry I do not. There are however a lot of very qualified people on here to answer that. I am going to make one observation, this is in retrospect of course. NEVER buy a boat without a water test, NEVER. Walk away if the seller is not willing to go to the lake. There seem to be a growing number of people that are more than willing to look at you in the face and LIE, without any hesitation.

 

[bernd64]

Re: GT150 Problems

you can run a 12volt pump to you have to wire in.this one you can pickup at a napa store for about $35

 

[wtp]

Re: GT150 Problems

I read to many horror storys on electric fuel pump on a outboard motor. I already ordered the ones piperdriver told me about the only problem I have now is I see no other place for the pulse signal.

 

[bernd64]

Re: GT150 Problems

you have to put a T in the pulse line

 

[wtp]

Re: GT150 Problems

not to be picky but one says each pump needs it's own pulse and another says put a T in it. I've been searching online for 1 1/2 hours for a answer or diagram and come up with nothing.

 

[piperdriver]

Re: GT150 Problems

http://s608.photobucket.com/albums/tt166/piperdriver83/?action=view&current=Evinrudefuelpump.jpg This is a link to the picture of my setup. Look at your motor closely. I'll bet that you have the second pulse fitting. It is probably capped. I have had more than a few good marine techs tell me NOT to put a "t" in the pulse line. One other thing that I forgot to mention. The screws that you are going to need for the pumps are a 10x24. They are longer that an 1 1/2" and shorter than 2". You will have to trim them to work.

 

[wtp]

Re: GT150 Problems

Thanks a bunch. My parts should (hopefully) be here tomorrow so I'll look for the other pulse location.

 

[wtp]

Re: GT150 Problems

Ok got my parts today. I also found the other location for the pulse signal. Here is my concern. I took the other nipple out so I could get the right thread and size of nipple but the one I took out had like a 2" brass tube attached to it with a thin flat spring steel looking thing in the tube. what the heck is that? I replaced it with the same nipple I installed for the other pump. Not sure if you'll know what I'm talking about but I hope it wasn't needed.

 

[piperdriver]

Re: GT150 Problems

Go back to the Evinrude website. Look at the parts diagram that you saw to order the pumps originally. You will see a spring with a part number. Is that what youa re talking about? I am not sure if that is needed or not. usally springs like that are used to hold the hose open. For instance on the suction side of the water pump in your car. Make a call out to some of the sages here on the forum. Call your local boat shop and see if you can get someone that has personal experiance. Be careful taking advise on these forums. Look at the number of responses. I am new to the forum, I would never knowingly give out eronious info. Cross check with local mechanics, people on here that have thousands of responses. There are some VERY knowledgeable people on here.
You saw how I did mine. This afternoon or tomorrow I will be out to see if It all works. One other thing that may make a difference, or not---plug the hose that was used for the oil injection to the carbs. That MAY lead to a lean condition if left open. When you water test try to have a second person with you. If the motor boggs and doesn't act right, have the other person pump the bulb and see if it takes off. Also if it is possable have the cowl off and if it is not acting right try flipping the manual enrich lever on the enrichment solenoid. That will just be a quick flip, and then back to the normal position. If you leave it in "over-ride" position, you could possably flud the motor. Good luck and post results--

 

[piperdriver]

Re: GT150 Problems

I think i just realized what you were asking. I think, not sure, but think that is a safety system that won't allow combustion gasses back into the fuel pump in the event of a backfire. I think----

 

[wtp]

Re: GT150 Problems

well got it all together and got to take it to the lake. Still no go. This time I got 26mph. Had to use fast idle everytime I started it. all out of ideas.

 

[wilde1j]

Re: GT150 Problems

The gas side of the VRO pump could have been rebuilt (see maxrules.com website). Other possibilities for fuel starvation:
. air leak on pump suction side (bad clamp, cracked hose, cracked tank pickup tube, etc., etc.)
. malfunctioning anti-siphon valve
. plugged tank vent
. trash blocking tank pickup screen
. plugged fuel filter
. collapsed fuel line

 

[wtp]

Re: GT150 Problems

The gas side of the VRO pump could have been rebuilt (see maxrules.com website). Already pulled off when I bpoght the boat


Other possibilities for fuel starvation:

. air leak on pump suction side (bad clamp, cracked hose, cracked tank pickup tube, etc., etc.) - replaced 1 bad pump with 2 pumps and cleaned all passage ways and put kits in the carbs

. malfunctioning anti-siphon valve - if yout taliking primer bulb it's new

. plugged tank vent - vent is fine and hose is new

. trash blocking tank pickup screen - pick up tube is not cracked and screen is clean

. plugged fuel filter - new

. collapsed fuel line - all lines are new with clamps