optimax fuel rail relief valve problem

[Razgo-]

Been trying to figure out some issues i have with my 115 optimax (2005). It runs a little rough and it seems to be fuel related. I replaced the primer bulb and fuel hose and all seemed good again for a while but playing up again.

I spoke to James at coorparoo marine and he said because i replaced the primer bulb having fuel issues i could check the relief valves on teh fuel rail by way of pressing down on them to release the pressure as this should re balance things.

The top valve and some air in it but eventually just fuel would come out after a couple of times.

The bottom valve however just has air coming out and no fuel.

Is this normal? or should it have fuel only coming out too?

I took it for a run late this afternoon and it seemed ok again but it usually takes about 20-30mins for it to start playing up so i will go for another run in morning and see.

russ

[Spaniard_King]

releif valves.. thats new

there fuel inspection points ie where you attach a gauge nto check the fuel pressure

I would be checking the entire fuel supply system for possible aire leaks, make sure you inspect the fuel line completely and replace anything that looks ordinary.

Have you changed the fuel filter of late??

Also drain the fuel from both drain points at the bottom of the vapor seperator, does this contain any solid particulate matter.

Seeing it takes 1/2 an hour to produse the problem check to see there is cooling water flow through the vapor seperator by removing the outlet hose when the engine is running. Thats about all I can suggest without actually inspecting it .

[Razgo-]

Hi Garry, It had a service last month and pretty sure they changed the fuel filter.

Been reading through this forum for hints on what to do also http://continuouswave.com/ubb/Forum3/HTML/014933.html

Thus my other thread relating to batteries also. someone had surging problems and simply cleaned the battery leeds and replaced wing nuts with hex nuts and no more surging. mine has wing nuts so i will change that also.

i found this interesting

"the battery is the problem, even if the motor starts. From my research, (and understand I am not a mechanic) I learn that the Optimax is a net consumer of electricity until the motor is running about 2500 rpm. What that means is that the alternator is not producing enough to both power the needs of the engine and extra for battery charging if you are putting around at 1000 to 1500 rpm."

thus my process of making sure i have correct battery supply and fittings too.

this morning it surged heavily at 1200RPM bouncing from 1200 to 1800 until i just shut everything down and restarted the motor and all good again.

russ

[Spaniard_King]

Make sure you check the connections on the engine too if the battery is that critical... sounds like your onto it tho

[Razgo-]

I never thought about et engine side of the connections so yeah i will check that too. Yes apparently battery, battery cables, battery connections are all "critical" so hopefully thats all it is is these smaller issues i can fix rather anything major.

i just don't know about that relief valve that's not bleeding any fuel on the fuel rail. that could be a big expense if i have to replace the entire fuel rail.

russ

[bden]

Hi Garry, It had a service last month and pretty sure they changed the fuel filter.

Been reading through this forum for hints on what to do also http://continuouswave.com/ubb/Forum3/HTML/014933.html

Thus my other thread relating to batteries also. someone had surging problems and simply cleaned the battery leeds and replaced wing nuts with hex nuts and no more surging. mine has wing nuts so i will change that also.

i found this interesting



thus my process of making sure i have correct battery supply and fittings too.

this morning it surged heavily at 1200RPM bouncing from 1200 to 1800 until i just shut everything down and restarted the motor and all good again.

russ

Russ,

I had the same experience the other day a posted a similar thread on another site.

I too had the surging problem on my 135hp Opti. Rather than surging down it surged up??? This continue intermitently for an hour until we switched off the engine and re started. Problem solved. The only time I have any problems with my Opti is when the Battery is nearing the end of its lifespan. I am presently looking to fit two new batteries to my rig. Optis are very voltage sensitive.

[Razgo-]

Hi, yes it was "surge up" as i was on 1200RPM but it kept popping up to 1800RPM.

the battery is brand new. but it is 720cca instead of the recommended 800cca.

on my way out again now to see what happens.

russ

[Razgo-]

I ended up ordering a new supercharger 950CCA Battery from bias boating $280.00. considering the 825cca all rounder is $289 i reckon i have done well.

probably won't see it until Monday.

[Dicko]

I ended up ordering a new supercharger

Im only read that part and smiled.

The optis like a good battery, be worth seeing if that is to blame.

Also, that part above from the US forum about them not surplus charging until over 2500 rpm is waffle. Optis like any other o/b will happily idle or troll along all day without sending the batery flat.

A quick check across the battery terminals with a meter before & after starting should clear that up.

[Razgo-]

Hi Dicko, i was surprised to read that about optis not charging the battery until 2500RPM.

I just phoned coorparoo marine and they advised me that bottom relief valve does indeed blow air not fuel. SO few! thats all ok then.

I will also check the vapor fuel separator i think its called? might do that tomorrow.

russ

[bden]

Hi, yes it was "surge up" as i was on 1200RPM but it kept popping up to 1800RPM.

the battery is brand new. but it is 720cca instead of the recommended 800cca.

on my way out again now to see what happens.

russ

Russ,

Identical problem. I will be looking for two new Batteries this weekend also.

My Batteries are 3 and 5 year old respectively. These may be Ok and the problem may only be terminal related however I have just checked and my Batteries are only 490CCA and really strugggles to kick over the engine on one.

Brett

[Razgo-]

Hi Brett, i just replied about my battery here http://www.ausfish.com.au/vforum/sho...=1#post1143688

the general consensus seems to be supercharger batteries are a good battery and optimax are amp hungry so I'm going for the 950cca