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Join Date: Jan 2010
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Re: easier diesel bleeding
I hope I don't get too much flack for this but here go's.
I have been around diesel's for at least 20 years. Take what you will from this information, all based on real experience.
Think of the system this way.
fuel line to lift pump or low pressure pump or supply pump call it what you like. anywhere around 4 psi sounds close.
one or more filters are on the low side.
Return line, remember this one it's the secret to a long happy life.
#1 I can't remember "cracking" an injector line on the high side (about 1200 lbs) ever for any reason even after installing a new pump.
#2 Every boat should have an electric pump on the low side, if you don't then get one , you'll learn to love it. You can buy them at any auto-parts store for around $20. electric gas pumps work fine in my experience. Shoot for something in the 4 to7psi range ( carborated cars used them back in the day) .
Install it in the fuel line before any filters or factory lift-pumps. I have always run mine with a switch and leave it off (they free flow) unless I'm bleeding the system. The low pressure lines on a diesel MUST be free of any possible leaks, this cannot be stressed enough.
Almost all fueling problems can be traced to air intrusion on the low side.
If you run out of fuel simply run your electric pump for a few minuets before cranking. The fuel will be pushed through the low side system and back to the tank.
Set throttle at about 1/4 to 1/2. With pump still running, crank motor while spraying WD40 into air intake.
WD40 will not hurt your motor but will run up rpms as it gets in. You can use starter fluid but you better REALLY know what your doing or you might kick a rod! or two! LOL.
It is a two man system unless your able to jump the starter solenoid as I do.
Keep in mind that you need to NOT release the starter too soon. Let it overrun the starter just a little.
It'll run a little funky at first (thats why it needs some throttle) but will straighten right out.
BTW. You should only have to do this when you run out of fuel. When changing filters you can avoid this by filling the new filters with fuel or trany fluid. And even though it can be a drag to work on, try to change filters on a motor that is warm. Much easier to start a warm diesel. And when starting after a filter change, keep the rpms up till she straightens out.
I hope this helps a little. If you can start a lawn mower you can learn to start a dry diesel.