D311 Genset fuel problem

Whatever it is, it's very good you caught it before it went through the pump. Probably a blob of diesel sludge and rust.

Our 212 grader went from great fuel pressure to zip over time. Most likely from eating debris out of the tank and recirculating it back through the bypass. I had drained the tank, flushed out the line etc, but there must have been enough left in there to do it. When I opened the relief valve/inlet fitting, there was a lot of rust in the bottom of the spring recess.😠

Your engine (with a bypass up top on the housing??) will at least not recirculate dirty fuel through the transfer pump.

CCJ, it remains to be seen if it's blockage. I just can't think of anything else and until that is elliminated, it's the next step. Man, I thought when I got the pony purring along, this was gonna be a cake walk. Murphy is still alive and well.

The bypass comes off the top of the filter body and dumps back in the tank right next to the supply line.

Yeah, I caught it all right. I tried my damnest to get that slug into into the pump gears. It's just dumb luck that I only had a bicycle pump to pressure up the fuel tank and could only get a pound or two in the tank. If I had my compressor handy, I could have put 80-90 pounds on it 😮 and really screwed it up. I never cease to be amazed at how lucky (ah - what I meant to say how smart I find myself sometimes).

Normally the transfer pump works in the range of from 15 psi to max of in the lower to middle 20 psi.on the engine you have. I dyno tested 100s of engines & always used a fuel gauge with the lbs. on it & that,s where they ran.I used the same type gauge with the numbers on it for oil pressure & also if turbo charged to check manifold boost pressure. The only thing with boost pressure it,s given in inches of mercury (HG) so that,s twice PSI so you,d take half the HG specs.

I pulled the pump and was greatly underwhelmed by the amount of debris in the inlet port. It was not a glob of anything but more a loose assortment of what looked like rust flakes. I guess if they all stood sholder to sholder in the narrow part, they could block some. It's hard to imagine how that happens without something larger starting the process. My guess on the source of rust is the fuel level guage which was kinda pitted on the lower end.

Some Rust Blaster was sprayed in the inlet port and purged with compressed air. Several iterations of that has apparently cleaned the pump out. Of course the starting cap on the compressor took that opportunity to short out but I had enough air reserve to complete the job. It's been my experience that happen in 3s. First the stopped up transfer pump, second the compressor starting cap, third 😕 ???

I did the normal things like drain the fuel tank after transportation stirred things up but suppose the debris was already in place. I will pressure up the tank and flow a few gallons of fuel through the supply line to be on the safe side. I may also install a in line fine mesh screen between the tank and the pump.

Thanks,
tom

Tom, I'm real glad to see you've found a D311 set. Hope you get through huricane season without needing it too much!

I've found nothing cleans out a fuel tank quite as well as removing it, turning it upside down and steam cleaning it inside. Pressure wash doesn't seem to do the job quite as well as the hot, wet steam, upside down so it can drain through the biggest hole in the tank--the filler. If you got crud, this is well worth the extra work.

I got the impression that reliability is everything here.

Jack

Hi Jack,

Great to hear from you again. The little D311 has been a education for me. It weighs a bunch more than I anticipated, is nearly 9' long, slobbers like nothing I've ever seen 😮 but it does put out power. I didn't leave it running for long when I saw how much oil it was dumping out the exhaust.

We dodged a bullet with the little "pop up" cat 1 hurricane a week ago and nothing on the radar screen for the short term.😄 I may have time to get a miss and the slobber issue corrected before I need it. The miss might be that I haven't fully bled the air out.

Are you planning to attend the Richmond show this week?

tom

99% of the time the slobber is caused by too much idle or no load on an engine so if you can but I know it,s hard with a gen. set like that but put it to hard work if you can find a way to use the power to do it & keep it on for a good couple hours or half a day if possible & see what happens.Also another thing make sure the engine is running up to operating temperature which is very important all the way around esp. with this slobbering problem.

SJ,

Thanks for the advise! I know a good long term load is the trick on the tractors, but you are right on the money with the difficulty loading a genset. I don't have a 3 phase load available and haven't made the conversion to single phase but do plan to put some load on it and run it awhile at operating temp. Before I do that, I'll have to move it out of the building its in or make a exhaust oil collector or hire someone to standby with a hazmat suit and a shovel to take care of the oil residue.

All kidding aside, I plan to build a baffled box with a drain to reduce the mess.

tom