1999 Johnson 150 HP VRO Fuel Pump Problems

[kmcgillis]

I am having issues with the boat once i put it into gear. It will idle fine but as soon as I put it into gear and try to give it gas it will die. If I flutter the throttle (I have a Hot Foot) it will sometimes go. I checked all the fuel lines and the pickup in the tank and all seam to be ok. If I pump the ball good and hard it will be ok for a while and then I can't seem to keep it running. I am guessing it is a fuel pump issue but at $350 I really want to make sure. Is there anyway to test the pump and is there anything else I should be looking at.

Thanks.

 

[tashasdaddy]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

start at the beginning of trouble shooting before spending $$$$. check you compression and spark with a spark tester. adjust tester to 7/16 inch. compression should be 100 psi or above, but must be within 10% of each other.

if all this is good, i would look into the carbs and a linc n sinc, before going to the fuel pump. it really sounds like you have contaminated carbs.

 

[tobym333]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

if it is the carbs whats the next course of action?

 

[jonesg]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

Carb kits, you can order them here on iBoats.
You need to do the tests first though.
It could be running on 5 cyl's.

 

[tobym333]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

first boat... can i pick up the equipment ( tester) from auto zone or any parts house?

 

[Chris1956]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

Toby, The fuel system on that motor is non-trivial. You would benefit from a genuine Johnson Service manual. That motor has an OMS pump to mix oil with the gas, and a vapor seperator and pump to help the OMS pump get only liguid gasoline.

As the others said, idle and acceleration problems are likely clogged carbs, fuel supply is OMS or vapor seperator, air leaks, restricted filters etc. That motor has six carbs. A service manual is a must.

 

[tobym333]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

yes sir. i ordered the manual from this website two weeks ago and amazon said it shipped it but the usps has not delivered it yet. im being patient, but im trying to get my ducks in a row before it gets here... soaking in all the info i can.

 

[tobym333]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

hey chris, also i pre-mix the fuel and oil my self. my uncle said the pump went out a while back. thanks in advance.. Semper Fi

 

[tobym333]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

hey chris what about a 1996 johnson 150? same one right?

 

[jonesg]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

first boat... can i pick up the equipment ( tester) from auto zone or any parts house?

Most decent auto part stores sell spark tester with adjustable gao for $12 or less, you need a compression guage too $30 or less.
All plugs out for both tests, fully charged battery.


Do the tests per the TOP SECRET faq files.
http://forums.iboats.com/showthread.php?t=299680

 

[tobym333]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

thank you sir.

 

[tobym333]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

all spark plugs out?

 

[d.boat]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

It's covered in the FAQ thread. Here's the link, http://forums.iboats.com/showthread.php?t=313963&highlight=compression but you should scan the thread entitled "top secret file", it is the FAQ for general diagnosis and maintenance and repair stuff. I have NO idea why they named this thread a cryptic name like that, why didn't they just call it FAQ so it's obvious to newbies.

That compression test thing is actually kind of confusing to non-mechanics, in my opinion. It doesn't explain why you should jump the starter instead of just cranking the engine with the key. That is because if the ignition is running, but the plug wires (remember all plugs are removed) aren't grounded, you can damage ingnition parts. Therefore you need to either ground all plug wires or crank the engine w/o the ignition firing. It also is not clear at all to someone with little experience exactly where you should connect the cables to jump it. (again, in my opinion).

 

[tobym333]

Re: 1999 Johnson 150 HP VRO Fuel Pump Problems

im still unsure on the process. is there a better explanation ?