fix for polymerization in fuel lines?
July 2, 2012 - 11:50pm
After 30,000 WVO miles in 2 years, my 01 Jetta TDI has been hesitating, struggling, like it's not getting enough fuel, a few minutes after being put on veggie...
So far: I changed the filter, cleaned out the filter head, cleaned the fuel cap vent, swapped out the supply solenoid, tightened up all the hose clamps, blew out the veggie line with air from the filter back; replaced all short fuel lines in engine compartment inc. diesel...problem persists.
When I last removed the veggie fuel line between the supply solenoid and the filter, at the filter end, I heard a pop noise, like it was under vacuum, and the line was empty, as usual. I'm suspecting poly build up in the fuel line. Anyone know of a good way to clean that out?
I put 80,000 WVO miles on an 03 before this and never had this problem...
July 3, 2012 - 7:00am
#2
i doubt if you have poly in the fuel lines. and if you do i doubt if its so bad it closes the line off. whats the lines made out of?
July 3, 2012 - 9:19am
#3
How about:
Use a vacuum gauge to check for suction force before the veggie filter when switched to veggie?
Use a vacuum pump at different location on the veggie supply system to see whether you can pull veggie easily from the veggie tank?
Air leak into your veggie supply system? A piece of clear fuel hose/fuel filter before the IP will help to identify that.
July 3, 2012 - 7:21pm
#4
It also sounds like it could possibly be a vacuum in the wvo tank.
Check your venting cap.
July 4, 2012 - 10:55pm
#5
I am having similar issues, now NO WVO will flow.
'82 MB 240D 2 tank greasecar.
New WVO Filter (notice my filter life has been decreasing down to 200 miles per before complete stop)
Valves are easily able to be blown through.
Vaccuum builds to 5 to get WVO out near IP (after the filter).
Also, was able to run in idle, below 30MPH on WVO, now not at all.
What Algecide do you use? I've never used it and have personally done 20K on WVO.
July 5, 2012 - 8:03am
#6
how do you filter at home?
July 5, 2012 - 9:51am
#7
I'm sure it isn't my filtration method, was gettingfilter life of 1000 plus.
1st 55 gallon----kitchen strainer---sit for over 24hr.
heat to "boil"
5 micron filter dripping into 2nd 55 gal. sit for over 24 hr.
July 5, 2012 - 10:17am
#8
thats sounds like a good home filter but i change my veggie filter every 10,000 miles and it doesnt need it. keep in mind if you never clean your veggie tank the bottom always moves up. 90% of the time the problem is dirty fuel or air in the fuel system. you could also get a vacume in the tank. after rereading your post it sounds like dirty fuel or a small air leak. but i would lean towards dirty fuel.
July 5, 2012 - 11:33am
#9
Thanks for the replies. I've suspected an air leak as well, since the line between the filter and supply solenoid is empty when I remove it, but I can't find one... Someone suggested it could be pulling air from the diesel tank... so I've kept it full, but it still happens.
Blowing the fuel line where it enters the filter, it blows back into the veggie tank. I'll try the vacuum check idea.
My fuel is very good to begin with... same stuff and method I've used for 6 years now... It sits for days, then runs through a 100 micron screen on a 55 g. drum, then power filtered through a 20 and then a 5 micron filter. Standard GC fuel filter in car, standard GC pex fuel lines. I've never used an algecide.
July 5, 2012 - 4:18pm
#10
Assuming the problem still there after replacing the veggie filter. So it is not dirty fuel related.
Another suggestion to try to identify whether you have veggie fuel restriction or slow air leak
into the veggie supply system :
A long purge would push ( all or most) of the air in your veggie supply system back to the veggie
tank. Do a long purge then switch back to veggie to see if it runs/drives fine. If it runs/drives
fine for a while then i would say there is no fuel restriction and you have air leak problem.
If the problem is still there right after the long purge then you have fuel restriction problem.
July 9, 2012 - 8:22pm
#11
I will try LONG purge. Thank you for explaining what it will do.
Anthony 82 240 Benz 2 tank GC system.
July 9, 2012 - 9:08pm
#12
Also had same problem. Line to tank blew thru fine. Oil ran thru it just sitting. Car stalled under acceleration. Turned out pex line was weak in a bend and would collapse under a vaccum when hot. New line fixed it.
July 11, 2012 - 5:48am
#13
I've done a bunch of long purges in the past, with no success... and the problem does seem to be worse/more frequent when the car has been running for awhile, so I'm liking the pex line collapse theory...it makes the most sense. Also, it just recently hit me: if when I pull off the fuel line coming out of the filter to the solenoid there is a popping sound like I mentioned, like there is a vacuum there, that would indicate that there is no air leak...if there was, there wouldn't be a vacuum, and no sound... duh... Don't know why I didn't figure that out earlier. I guess because the line still appeared round, I assumed it was full of air, and I wanted it to be something simple...
July 11, 2012 - 10:17pm
#14
Interesting, I also WAS able to run no issue idle, up to 30 MPH...then like the WVO line was being choked.
Anthony
July 11, 2012 - 10:18pm
#15
Vaccuum maintains on WVO side (I can even pull cold WVO through) using my hand vaccuum gauge/pump....collapse sounds possible.
Where can you get pexline? here at Greasecar.com?
Thanks.
July 11, 2012 - 10:28pm
#16
Yes can get it here. Pex or alum tube. Keep the hoses routed so they won't hit speed bumps or road debris. And avoid tight bends.
July 31, 2012 - 1:51pm
#17
Any trick to removing PEX line?
My old one is "stuck" into the greasecar WVO tank pretty good, afraid to cut it and not be able to place new one on.
Anthony
September 10, 2012 - 11:02pm
#18
REplaced it...worked for 634 miles, not sure it works now....exact same issue...I noticed I took one of the bends wrong...and it is on the exhaust manifold....I am betting I need another PEX, ordering today.
September 11, 2012 - 9:17am
#19
REplaced it...worked for 634 miles, not sure it works now....exact same issue...I noticed I took one of the bends wrong...and it is on the exhaust manifold
Did you find anything wrong with the old pex line?
Are you running the new pex line inside a coolant hose?
If yes, what's wrong with that bend? Did you see the coolant hose cooked by the exhaust manifold?
Hard to believe you need a new pex line!
Suggest to replace the veggie filter first to see what's going on.
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did the feed line blow clear to the tank?