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DaveL

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Reply with quote  #1 
Hello All,

looking for some advice on an intermittent fault both at idle and high rev's it cuts out. After various investigations looks like the fuel is not being drawn through the filter. Engine will fire up when primed and eventually cut out as the fuel level drops in the filter. Have already changed the lines from the tank to the engine and changed the lift pump too but the problem still exists.

I bought outboard (& boat) a couple of months ago which about 10 years old but has less than 100 hrs on the clock. I keep the boat in a remote location so taking to a dealer is significant hassle. 
Gotsea

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Reply with quote  #2 
Davel, you have to do a full fuel system check, fuel pressure, vacuum and pressure test as well, apparently the motor is staving for fuel
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1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
PhilH12

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Reply with quote  #3 
++ to Gotsea.  I'd be looking first for "loose flakes" that may be swimming in your fuel tank.  With suction, they get stuck to the pickup and block the line, and then release and drop off when the motor stops, and quits pulling fuel.

That motor and tank has sat still for a while, so may be varnish flakes floating around in there.  Pressure and Vacuum Tests 'may' pick them up, but maybe not, unless run for long enough time.

Have you changed the fuel filter(s)?  An in-line 'boat mounted' filter with clear sight bowl (Racor is often recognized as Best) is recommended if you don't have one, in addition to the filter that's under the cowl.  I might "gently" pull the pickup tube and have a peek at that, too.  Look to see if there is anything still stuck on there.

I'd also look at the "quick connect' at the tank.  Was it made to flow like a 3/8" or even 5/16ths" ID hose? although at idle, it should get enough.

An EV bulb on there in the fuel line?  Many aftermarket bulbs have 'check valve opportunities' that won't flow enough fuel.  Also check the anti-siphon valve for flow.

Starving it for fuel is pretty near the quickest way to turn that motor into scrap, so it is time to be "thorough" in your investigation!

Phil

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20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
Nordmann

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Reply with quote  #4 
Experienced similar problem with a 2007 90. Turned out to be sticking (shut) VST valve. Worth checking.
Cheers

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DaveL

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Posts: 7
Reply with quote  #5 
Thanks for the quick responses guys.

- all the lines including the bulb have been replaced so hopefully that rules out Phil's suggestion. (Have also checked the tank thoroughly - nothing alien in there by the looks of it ) 

- Have got a hold of a pressure gauge so will try this at the weekend

- Will also check out the VST Valve as this was suggested by another friend.

Will keep you posted on developments.

Dave
Crosbyman

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Reply with quote  #6 
vst filter also....to be checked 
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ETEC 75 HP  2005  ser# 05107924  &  1966  9.5 hp  Sportwin 9622a 
DaveL

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Posts: 7
Reply with quote  #7 
Guys,

Any specific advice when removing the VST  ? I'm assuming I need to remove the whole unit ?

Thanks,

Dave
olypopper

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Reply with quote  #8 
"Any specific advice when removing the VST"

Yes, be very CAREFUL not to break any of the plastic fittings on the VST.  Also, you might want to have a new 354190 vst filter on hand as sometimes they'll get damaged upon removal.  Depending on the year/model of your engine, it may be equipped with quick connect type fittings.  The newer engines have oetiker clamps installed and present a challenge to those not familiar with their removal.  Use caution when cutting/removing the clamps as you can break the plastic nipples on the VST while doing so.  

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PhilH12

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Reply with quote  #9 
Care and gentle are the words!  It's inside the hose on the Lower Right FRONT hose when looking at the VST tank, so that's all you need to remove - 1 hose.  Be Real careful with the plastic tank nipple, as if you crack it, it's time for a whole new tank.

Someone on here (Gotsea?) also suggests a #10 sheet metal screw about 1/4 turn into the rubber end of the filter to pull the filter out of the nipple, rather than trying to pry it out.  A couple of good shots of Gumout, etc. will have you back in business.

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
DaveL

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Reply with quote  #10 
Thanks a lot for all the advice.

(Yeah those Oetiker clips are a real pain !)

Will check out this weekend from all the tips supplied.


DaveL

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Posts: 7
Reply with quote  #11 
Hi Guys,

Performed tests as you suggested.

- Tried another fuel tank - no change

- Removed the fuel filter - which on inspection on the underside looked pretty clogged up - changed to an alternative - seemed slight improvement but still engine cut out after a while. (plenty of fuel pressure evident)

- Bit the bullet and removed the VST - found the little filter clogged up. Cleaned and replaced. Other parts of the VST seemed clean and operational. Took out the float valve which seemed to move up and down without issue. ---- does the orientation of the float matter ? Anyway stuck everything back together and there seems to be a big improvement in fuel flow to the main filter. Need to now get the boat in the water to test fully, the wet Scottish weather beat me yesterday! Will also take a note of pressures on high and low side.

- I'm assuming that the fuel filter should remain full under normal operation ?

Hi Guys,

I've been out of circulation for a while a bit like the outboard. Here's what I've found yesterday when I eventually got the time to spend on the problem.

- The issue doesn't happen above 3000RPM
- I put a fuel pressure gauge on between the bulb and the engine with clear tubing.
- Pressure at 3500RPM was steady at 5.8bar and 6.0bar at full throttle which is  4000RPM.
- Noticed lots of air in the line, then when throttling back below 3000 it starts to fault and stutter. At lower rev's the pressure drops completely. I can fix it by priming before it cuts out.
- I'm not a 100% sure but it seems to be better when the tank is completely full... but I could be imagining that!

- So is my thinking right that I go back and look at the tank and pick up ? Will try another tank to check the logic. (It's a new line already from tank to Engine)

Dave

PhilH12

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Posts: 3,503
Reply with quote  #12 
When running, the fuel filter will be only 1/3 - 1/2 full of fuel.  Have heard of them around 1/4 full with no problems.

Good luck!

Phil

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Always check the Easy Stuff First!
20' Weeres fishing pontoon
90 HP E-Tec E90DPLSUM  05184332
Lake Tawakoni, TX - Catfish Capital of Texas
DaveL

Registered:
Posts: 7
Reply with quote  #13 
Hi Guys,

I've been out of circulation for a while a bit like the outboard. Here's what I've found yesterday when I eventually got the time to spend on the problem.

- The issue doesn't happen above 3000RPM
- I put a fuel pressure gauge on between the bulb and the engine with clear tubing.
- Pressure at 3500RPM was steady at 5.8bar and 6.0bar at full throttle which is  4000RPM.
- Noticed lots of air in the line, then when throttling back below 3000 it starts to fault and stutter. At lower rev's the pressure drops completely. I can fix it by priming before it cuts out.
- I'm not a 100% sure but it seems to be better when the tank is completely full... but I could be imagining that!

- So is my thinking right that I go back and look at the tank and pick up ? Will try another tank to check the logic. (It's a new line already from tank to Engine)

Dave
Johnnielund

Gold Level Member 3-2010
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Posts: 427
Reply with quote  #14 
Hi Dave,
I realize I'm not answering your question, just an FYI for you.  The wide open throttle for a 75 E-TEC should be between 5000 and 5500 RPM, with 5200 RPM being the sweet spot.  You can possibly do some damage to your E-TEC by lugging it.  First check to see if you tachometer is reading correctly.
Jim
DaveL

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Posts: 7
Reply with quote  #15 
Ok Jim - thanks for this. 

I need to take it to back  for a service over the next few months so I'll have them check it out.
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