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200 HPDI - VST filter?

Old 07-22-2015, 06:20 AM
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Default 200 HPDI - VST filter?

I'm having issues with one of my 200's this week. The motors have 90 hrs on them. One motor is running fine - the other will cut RPM's to almost nothing when accelerating. The first day when i had this issue - i couldn't even give it enough throttle to get on plane without it cutting. I changed the water separator filter for that motor and it was pretty much 100% better.

The next day - i thought the problem was solved but it showed up only in a few circumstances.

1) heavy throttle to get to speed
2) it seemed to not like having the motors trimmed low. The motor would cut - then i'd trim it up a bit and everything was fine... Maybe this is because the motor was at a higher load and demanding more fuel?
3) rough seas - if going over a big wave - it would occasionally cut. I also think this might be because a higher load was put on the motor for a moment requiring more fuel.

From what i've read - this sounds like a VST filter problem - but i just find that weird with only 90 hours on the motor. Any thoughts would be appreciated. Thanks.
Old 07-22-2015, 06:27 AM
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Check your water sep. Sounds like water in the fuel. you might also drain some fuel from the VST, but release the fuel pressure prior.
Old 07-22-2015, 07:06 AM
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Originally Posted by keywest49 View Post
Check your water sep. Sounds like water in the fuel. you might also drain some fuel from the VST, but release the fuel pressure prior.
I did swap the water sep the other day and it got a lot better but is still acting up.
Old 07-22-2015, 07:09 AM
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It is amazing how just a little water will affect these engines. Was there water found in the filter? If so you got to find the source.
Old 07-22-2015, 07:14 AM
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I recently bought a boat with a 2005 model 225 hpdi with only 45 hours on it. Bought it cheap because it would barely plane the boat off and would cut out if you gave it too much throttle. Fuel had obvious globules of something suspended in it. I drained the tanks and replaced all the filters including the HP "mystery" filters and had the injectors serviced. Its run like a champ since. The HP filters were full of a gel like substance that when allowed to dry felt almost like sand.
Old 07-22-2015, 05:42 PM
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Originally Posted by silverbullet87 View Post
I'm having issues with one of my 200's this week. The motors have 90 hrs on them. One motor is running fine - the other will cut RPM's to almost nothing when accelerating. The first day when i had this issue - i couldn't even give it enough throttle to get on plane without it cutting. I changed the water separator filter for that motor and it was pretty much 100% better.

The next day - i thought the problem was solved but it showed up only in a few circumstances.

1) heavy throttle to get to speed
2) it seemed to not like having the motors trimmed low. The motor would cut - then i'd trim it up a bit and everything was fine... Maybe this is because the motor was at a higher load and demanding more fuel?
3) rough seas - if going over a big wave - it would occasionally cut. I also think this might be because a higher load was put on the motor for a moment requiring more fuel.

From what i've read - this sounds like a VST filter problem - but i just find that weird with only 90 hours on the motor. Any thoughts would be appreciated. Thanks.
Cleaning/changing my VST filter (200 Ox66) is pretty much part of my 100 hour routine, so needing it at 90 hours isn't out of the question.
Old 07-23-2015, 07:48 AM
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It's most likely the VST. If I were you I'd change out the VST filter and the expensive metal one connected to the outlet of the VST. About 140 bucks of filters, o-rings and clamps should fix it.
Old 07-23-2015, 11:07 AM
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Change the three main fuel filters in the motor. High pressure filter, VST and the cartridge at the front of the motor in the housing.

The high pressure filter is a PIA to get those compression fittings off so patiences are important...

By way of reference, blow with your mouth into the new high pressure filter and take note of how unrestricted it is.

After changing out, do the same with old filter and you will be very surprised at the restriction.
Old 07-23-2015, 11:04 PM
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Be sure to let us fellow HPDI'ers know what fixes your motor!
Old 07-23-2015, 11:15 PM
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Originally Posted by akholmes View Post
Be sure to let us fellow HPDI'ers know what fixes your motor!
Yeah and how much time and money it costs to fix. Good Luck with this problem your going to need it.
Old 07-24-2015, 07:33 AM
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Originally Posted by ShadBurke View Post
Change the three main fuel filters in the motor. High pressure filter, VST and the cartridge at the front of the motor in the housing.

The high pressure filter is a PIA to get those compression fittings off so patiences are important...

By way of reference, blow with your mouth into the new high pressure filter and take note of how unrestricted it is.

After changing out, do the same with old filter and you will be very surprised at the restriction.
^^ This is what you need to do to start. I do not know how old or year your engines are, but I am assuming that with the low hours the boat sits for a very long time. If this is the case and using ethanol fuel (again, I am assuming) will cause all sorts of problems. A lot of people on this forum will dispute this as they say they always use ethanol and never had any problems, but some of those same people will also say that they had to drain there tanks at one point for issues. So, replace all your filters on the engine's especially the HP "mystery filter" and if the fuel is very old then drain the tank and start with fresh fuel (REC 90 Fuel). Maintenance is key on these engines.. I am the second owner on my boat and it has never seen ethanol and has always had it's maintenance done with all filters done yearly. They have over 1200 hrs with no problems thus far..
Old 07-27-2015, 07:59 AM
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Originally Posted by joecastle View Post
^^ This is what you need to do to start. I do not know how old or year your engines are, but I am assuming that with the low hours the boat sits for a very long time. If this is the case and using ethanol fuel (again, I am assuming) will cause all sorts of problems. A lot of people on this forum will dispute this as they say they always use ethanol and never had any problems, but some of those same people will also say that they had to drain there tanks at one point for issues. So, replace all your filters on the engine's especially the HP "mystery filter" and if the fuel is very old then drain the tank and start with fresh fuel (REC 90 Fuel). Maintenance is key on these engines.. I am the second owner on my boat and it has never seen ethanol and has always had it's maintenance done with all filters done yearly. They have over 1200 hrs with no problems thus far..
I took it out 1 more time since posting to do some testing. It's only cutting out when the motor is trimmed way down. At higher trims (normal cruising) it runs fine. I'm going to empty the VST tank, and change the VST. I'm thinking maybe there is water in that small tank that's getting picked up at that low trim angle. ;? It'll be a couple weeks until I can get out to test again but i'll report back.

On another note - I ran into an oiling issue with this motor last outing that i'm pretty sure is unrelated but figured i'd mention it. Oil warning screaming on the display and the motor shut down. The engine oil tank got to the low level point - and manually priming the tank I wasn't getting oil pumped up. Turns out the small filter in the back of the AUX tank was clogged. (replacing these on both tanks now).
Old 08-24-2015, 06:44 AM
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Originally Posted by silverbullet87 View Post
I took it out 1 more time since posting to do some testing. It's only cutting out when the motor is trimmed way down. At higher trims (normal cruising) it runs fine. I'm going to empty the VST tank, and change the VST. I'm thinking maybe there is water in that small tank that's getting picked up at that low trim angle. ;? It'll be a couple weeks until I can get out to test again but i'll report back.
I'm still battling this issue. I've been out twice testing since replacing the VST filter and the issue is the same if not worse. The port motor can not sustain RPM's under load. It maxes out at 2500 and will shake and throw a fit if you try to push it past 2500. The starboard motor is a beast and does whatever i ask of it. I ordered a YDS today so i'll see if that helps point me in the right direction. (these motors only have 100hrs btw) I find it hard to believe the mystery filters would be blocked up. The VST was pretty damn clean.

I should add that the port motor will get up to like 3-3500 rpms if you go full tilt on the starboard motor to get the boat on plane. It's certainly a matter of how much load is on the engine that determines if it will cut out or not.
Old 08-24-2015, 06:49 AM
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Did you also replace the expensive canister filter between the VST and the high pressure pump?

Why do the motors have such low hours? Were they sitting for a while?
Old 08-24-2015, 06:51 AM
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Originally Posted by Whaler27 View Post
Did you also replace the expensive canister filter between the VST and the high pressure pump?

Why do the motors have such low hours? Were they sitting for a while?
I didn't - i think i'll pull it out to see how it looks - but with 100hrs i don't see how it could be clogged. It's next in line down the fuel system of course - but i'm just struggling to see how that filter could be restrictive when the VST was pretty much mint.

Previous owner didn't use the boat much - so yes it did sit quite a bit.

edit - I also put in a set of fresh plugs but nothing changed.

Last edited by silverbullet87; 08-24-2015 at 07:24 AM.
Old 08-24-2015, 09:16 AM
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Originally Posted by silverbullet87 View Post
I didn't - i think i'll pull it out to see how it looks - but with 100hrs i don't see how it could be clogged. It's next in line down the fuel system of course - but i'm just struggling to see how that filter could be restrictive when the VST was pretty much mint.

Previous owner didn't use the boat much - so yes it did sit quite a bit.

edit - I also put in a set of fresh plugs but nothing changed.
With it having sat a lot, I would change out those filters too. The fuel in the line between the VST and that filter could have gummed up from sitting for a while. They are going to need to be replaced at some point anyway so you might as well do it and also the basket filter before the VST. That way you'll know you've got clean filters all the way prior to the HP pump.
Old 08-24-2015, 09:24 AM
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Originally Posted by Whaler27 View Post
With it having sat a lot, I would change out those filters too. The fuel in the line between the VST and that filter could have gummed up from sitting for a while. They are going to need to be replaced at some point anyway so you might as well do it and also the basket filter before the VST. That way you'll know you've got clean filters all the way prior to the HP pump.
Yea i'm going to pull the metal canister filter today and replace. I'm hoping i find a gummy mess
Old 08-24-2015, 09:36 AM
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I too have a 200 HPDI with less than 100 hours on it and it is an '07 engine. That means it probably has 500-2000 hours on the water and over 70,000 hours of life! Point being, gasoline with contaminates in it can go bad in hours, if not minutes. An owner of an HPDI engine has no alternative but to make sure only clean gasoline, ethanol or non-ethanol gets to their engine. Even then, you are not guaranteed a problem free fuel system, but the chances are much better with clean fuel. The reason I say no guarantee is there are too many components to the system which can fail or deteriorate, especially hoses.
Old 08-24-2015, 09:39 AM
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Originally Posted by silverbullet87 View Post
Yea i'm going to pull the metal canister filter today and replace. I'm hoping i find a gummy mess
I just went through this same exact process. My VST looked pretty good but my canister filter felt like I was blowing through a pin hole when I blew through it.

I replaced the hose between the VST and the canister filter since it was turning my hand black, I can only imagine how bad the inside was. Just so you don't get discouraged, I was having identical problems to yours and it really didn't fix itself until I changed the mystery filters and serviced my injectors.

Are your plugs fouling?
Old 08-24-2015, 10:49 AM
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only seeing 3500 RPMs could be your neutral switch going bad. this keeps the motor in 4 cylinder mode and will run rough as a result, also wont go above 3500 rpms.

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