|Topic Review (Newest First)|
|03-24-2008 08:24 PM|
Since you're experiencing loss in rougher seas, you may also have a loose ground on your fuel pump. If there is a internal float on your pump it may be water (fuel) logged and signaling the pump to shut off. Also, since it's a diesel, it could also be a loose fitting fuel line or a crack in the fuel line, which would cause RPM loss or killing of the engine.
All the suggestions so far have been really good and would be good to check all of them.
|03-24-2008 08:18 PM|
|PBzeer||Something else to add in the equation, though this is only my experience. Everytime I've had a filter clog, it's been when I've topped off my tanks with something other than Valtech fuel. Could just be coincidence, but that's been my experience to date.|
|03-24-2008 08:12 PM|
Thanks to all for the ideas.
We were under engine power yesterday for about 10 hours straight in calm seas. No problems whatsoever. The engine performed brilliantly.
Two candidates right now for what we believe it is.
1) Crud on the bottom of the tank - clogging the intake.
2) Intermittant blockage of the tank vent. (Crud in the vent line or it may somehow being pinched.)
We're going to trace all the lines in the next few weeks. We'll also have our fuel polished.
Sabreman. Thanks for that data point. Our filters definitely have a dark gray spot on at the intake side of the filter. Looking closely you don't see anything like crud or contaminants.. but if yours are clean, then so should mine.
sadly... I lost the pic I took.
|03-23-2008 08:44 PM|
IMHO, you filters should be pristine. They should look the same as when you put them in, only wet. I get nervous if I see anything on my filters.
It mat seem obvious, but I recommend adding biocide when fueling.
Let us know how everything turns out.http://www.sailnet.com/forums/images...s/confused.gif
|03-23-2008 08:40 PM|
Sometimes it's best to fit an electrical fuel pump... I fitted the Stewart Warner 235A-D... and it will pressurise the fuel stayem to 5 psi. I know there is a fire risk, but having weighed it up, it is better to see fuel leaking out and know about it, than air leaking in and not know until the motor stops.
I suspect that you are picking up crud and slime from the floor of the tank, and your engine mounted lift pump is struggling to feed the motor.
Does your tank have an inspection hatch on there? If it does, get a flashlight and a wee piece of mirror. Drop the mirror to the floor of the tank and shine the light in there. It really should be very clean indeed. if not, then that will be your problem, I suspect.
An electrical charge pump, working well, will mean that the engine lift pump is not needed. Pressuring to 5 psi makes a huge difference. Look carefully at the fuel filter bowl. I hope it's the transparent type. the fuel should be red, and clean.
PM if you wish.
|03-23-2008 07:40 PM|
Let me ask you guys a question.
When you say "fuel pump" you're talking about the main pump that pressurizes the system... NOT the lift pump right?
The lift pump gets the fuel to where it needs to be, but it's the "main" fuel pump which pressurizes the system, and sends the fuel back to the tank. That's my understanding. Right?
Thanks for clarification. 5 years studying mechanical engineering you'd think I'd know a weee bit more.
|03-23-2008 07:34 PM|
Originally Posted by chucklesR View Post
PS I'm about 5 miles from the bridge now!!!!! ALMOST HOME!
|03-23-2008 07:28 PM|
Originally Posted by danielgoldberg View Post
awesome ideas... We're leaning right now towards the screen /.crap on the intake too.
This morning before setting out I again, blew into the tank. Following this *very scientific* procedure fuel flowed much quicker from the line into a catch basin. Hmmmmm
Then engine has now been running in calm seas for 6 or so hours without so much as a hiccup. Perfect.
Had compression checked in December... Looks good.
Thanks again for input!
|03-23-2008 07:18 PM|
Originally Posted by Sabreman View Post
Thanks alot for your insight.
I have the Raycor and the final. There have been mods on the lift pump. It has a different version than the one that came stock. NO FILTER.. hmmm
Will investigate further.
Again... thanks so much for sharing.
|03-23-2008 01:33 PM|
My W 30b does if fact self bleed. I had similar problems to you when I got my boat (and new engine) last year - the problem was the electric fuel pump had a loose connection.
The pump puts out 25 gallons a hour and you are using about 3/4 of a gallon of that, the rest gets recycled thru the tank and filters again. You are in fact polishing your fuel every couple of hours you run your engine - if the pump is running full time as designed. Finding the problem is difficult because as long as it runs every couple minutes you have enough pressure and fuel to run. It's when it goes a while that life sucks.
Check the 12v connection, tighten clean etc..then check the pump. If your really want to get fancy wire a light to the pump side of the connection and put it somewhere you can see it while the engine is running. Then you'll know if it's intermittent. Intermittent problems suck to find.
Eliminate the tank and pickup tube issue by getting a 5 gallon can of diesel and hose then feed the engine directly from there as a test, with the unused fuel going back to the same 5 gallon can (see below).
Troubleshooting possible multiple issues is simpler if you can eliminate one piece at a time.
It might be a air leak - easy way to check for that is to take off the hose that sends unused fuel back to the tank and put it into a bucket, run the engine and see if you have bubbles in that bucket (pre-fill the bucket with some fuel and put the hose under the fuel so you are not making bubbles with flow).
Westy's are good engines, but the electric pumps are somewhat exposed and prone to getting the connections knocked around while doing maintenance. The bad news is a replacement is 158 bucks (I've got two spares, I'll be glad to give you a discount). The good news is - almost any 12v fuel pump from autozone will do the same job for 40 bucks - damn, just killed my own sale.
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