injector pump problems? - Page 2 - PeachParts Mercedes-Benz Forum

xceth · #16 04-08-2007, 11:35 PM

At a quick glance, I see about 40 potential failure points, not counting the french fries and chicken bones. Of course, I may have missed a few.

^clearly you aren't a very big fan of vegetable oil conversions, i don't blame you, but i will repeat my self: this fuel system has worked for tons of other people, and not two weeks ago was working just fine on my car.

Palangi · #17 04-08-2007, 11:45 PM

Quote:

Originally Posted by xceth

At a quick glance, I see about 40 potential failure points, not counting the french fries and chicken bones. Of course, I may have missed a few.

^clearly you aren't a very big fan of vegetable oil conversions, i don't blame you, but i will repeat my self: this fuel system has worked for tons of other people, and not two weeks ago was working just fine on my car.

Sorry dude, no offense intended, but if you search through the diesel forums here, you will find literally dozens of threads about cars with wvo hacked fuel systems which do not run right. On most of such threads, the original poster never comes back and says the problem got fixed, so I can only assume that the problem was unable to be resolved.

Of course, it's your car. Feel free to do whatever you want with it.

Bio300TDTdriver · #18 04-08-2007, 11:55 PM

Quote:

Originally Posted by Palangi

Sorry dude, no offense intended, but if you search through the diesel forums here, you will find literally dozens of threads about cars with wvo hacked fuel systems which do not run right. On most of such threads, the original poster never comes back and says the problem got fixed, so I can only assume that the problem was unable to be resolved.

Of course, it's your car. Feel free to do whatever you want with it.

I was just thinking that myself. Almost every thread with "WVO" in it also has "air leak" in it. I guess you really do save big money with WVO, if the car doesn't run you don't have to buy any fuel.

Chris

Palangi · #19 04-09-2007, 12:03 AM

Quote:

Originally Posted by Bio300TDTdriver

I was just thinking that myself. Almost every thread with "WVO" in it also has "air leak" in it. I guess you really do save big money with WVO, if the car doesn't run you don't have to buy any fuel.

Chris

Yep.

Let me state again, just for the record, that I have absolutely nothing against experimenting with alternative fuels. These hacked fuel systems are getting to be a pain in the butt though.

I guess I shouldn't complain. The more cars killed off by hacks, the higher the value of my cars becomes.

xceth · #20 04-09-2007, 08:46 AM

when i decided to convert my car to run on WVo my intention was to convert it the conventional way, the improve on it for a for reliable system. there is a logical reason for more air leaks on conventional WVO systems in a Mercedes. when you run on vegetable oil, the fuel system is rearranged so that it pulls fuel through all the filters, etc. a connection under suction is much more sensitive to air leaking in, than one under pressure.

back on subject:

are there any diagnostic tests i can do to tell where the problem is? so far all you guys seem to do is speculate

Thanks,
Ethan

Palangi · #21 04-09-2007, 11:36 AM

If you restore your fuel system back to its original factory condition, it will run correctly. That ain't speculation. You have chosen to modify your fuel system in an attempt to run on substandard fuel. You're on your own. If you can make it work, great. If you can't, too bad.

Your fellow wvo'ers seldom join these threads with good solid suggestions. Apparently they can't make it work either.

P.E.Haiges · #22 04-09-2007, 12:04 PM

xceth,

Pulling the fuel thru the filter may be the problem. The original filter has a bleed hole to purge any air in the system. Pulling the WVO thru a filter does not have that option.

Can't U change the fuel system so it pushes the WVO thru a filter that has a air purge hole?

P E H

Whiskeydan · #23 04-09-2007, 12:46 PM

Quote:

Originally Posted by xceth

are there any diagnostic tests i can do to tell where the problem is? so far all you guys seem to do is speculate

Thanks,
Ethan

Bottle feed it yet???

Stevo · #24 04-09-2007, 01:06 PM

Quote:

Originally Posted by Palangi

You have chosen to modify your fuel system in an attempt to run on substandard fuel. You're on your own. If you can make it work, great. If you can't, too bad.

Your fellow wvo'ers seldom join these threads with good solid suggestions. Apparently they can't make it work either.

I have a feeling there are going too be an ever increasing number of diesel MBs for sale on the market cheap with problems due too hacked up WVO systems. Some one should come up with a "restoration" kit.

tomnik · #25 04-09-2007, 01:35 PM

Quote:

Originally Posted by P.E.Haiges

xceth,

Pulling the fuel thru the filter may be the problem. The original filter has a bleed hole to purge any air in the system. Pulling the WVO thru a filter does not have that option.

Can't U change the fuel system so it pushes the WVO thru a filter that has a air purge hole?

P E H

This is the key.
The set up in the drawing is not o.k.
Filters are always after the (lift-)pump.
The delta-p before the pump is not enough to pass fuel.
Your engine is starving.
The correct set up is not quite easy using the lift pump for both fuels. The 2 lines meet thru the pump and have to be separated after the pump.
You should feel it when operating the lift pump.

Tom

xceth · #26 04-09-2007, 03:00 PM

i realize the system is flawed, and i as i stated earlier in this thread m,y plan is to improve upon it. the fact that the car ran perfectly fine on it for a few weeks, then randomly stopped after sitting in my garge for a night is what has me thinking theres somthing else going on. i am going to replumb it back to the stock fuel setup later this afternoon, but i have a hunch it won't fix it. i'll get back to you guys tonight with the results.

xceth · #27 04-09-2007, 08:51 PM

Quote:

Originally Posted by Palangi

If you restore your fuel system back to its original factory condition, it will run correctly. That ain't speculation. You have chosen to modify your fuel system in an attempt to run on substandard fuel.

well heres the news:
today i replumbed the system to the stock setup and it still does not work! (hear that Palangi?) the same symptoms occurred. cranks, fires, runs rough for 5-10sec, then dies.

next i filled a bottle with fuel and ran it out of the bottle. this actually helped the most. it idled out of the bottle for around 20-30sec before stalling.

I ordered a set of new filters, and i will replace all the filters when they come... although the ones in there now have only been in for a few months, most of which the car was sitting in the garage.

now that we have established it was not the veggie system does anyone have any ideas on what i should try next?

Thank you.

#28 04-09-2007, 09:02 PM

The filters (regardless of their age) are the next logical step. Hopefully you did not damage the IP due to the WVO setup (either due to the WVO itself or due to air leakage). In any case, you need to rule out the filters.

xceth · #29 04-09-2007, 09:10 PM

well i never even got the chance to run any WVO thru it. i drove it with the WVO system installed, but on diesel. then it stopped working.

one other question i had... does the return from the injector pump also act as a supply when it needs it? because i have noticed that when i try to start the car, fuel is getting pulled in the return line, instead of being pumped out of the return line....?

#30 04-09-2007, 09:27 PM

Quote:

Originally Posted by xceth

one other question i had... does the return from the injector pump also act as a supply when it needs it? because i have noticed that when i try to start the car, fuel is getting pulled in the return line, instead of being pumped out of the return line....?

Not that I've ever heard of, but that might make sense if the filter was clogged.