Cooljay,

I could do that but it had run fine with no issues for a month or so.

After I changed the system out, and started to drive the car, I noticed a lot of cr*p in the filters, so I bought a bunch and changed them both out every 4/5 days No issues until i got stuck one night and I could not get it started until I noticed that the secondary housing was empty and filled that. This was then a constant issue, so I decided to change the screen in the tank. That screen was in bad shape. I thought from there it was solved and no such luck.

So it was right before the changing of the screen in the tank, that I realized that the secondary fuel filter housing was not getting fuel.

So now it on to troubleshooting.

I'm going to purchase a new copper washer for the top of the secondary filter and go on from there.

Silly question that just occurred, the o-ring that vstech referred to, is that the seal for the top of the housing he referred to or should there be an o-ring where I now have a copper washer? I have a copper washer where the hollow bolt secures the top of the housing.

Anyway, thanks, sooner or later I (we) will get this figured out.
Gets frustrating after a while, this is going on three/four days for me.

I would guess the lift pump is bad.....Its the only thing left....specially if this started up before you dropped the tank....

Also just changing the tank screen in a tank that was used to run wvo in.....isn't good enough, you have to drop it and clean it or what I found was easier....to replace it...

__________________

There's two fuel lines coming from the rear on the driver's side of the engine compartment.

The line on top bends upward and the cigar line is fastened to it and the bottom line, which remains straight, is attached to the primary filter line.

And looking at the fuel tank where the lines return to the tank the upper one appears to be the return line it is towards the top of the tank while the primary fuel line is under it.

Also there was an auxiliary tank which was utilized for the veggie oil.

But once I get this figured out, that is a very good idea.

What about this one, the o-ring that vstech referred to, is that the seal for the top of the housing he referred to or should there be an o-ring where I now have a copper washer? I have a copper washer where the hollow bolt secures the top of the housing.

I'll also try Kerry's idea and see how much the lift pump is moving.

Thanks again!

Since this is a w115 what type of secondary fuel filter housing do you have? Does it take the cartridge type filter or a spin on filter?

I wouldn't think there would be anything wrong with the housing, if this was the case it would leak fuel....even if there is a leak the lift pump will still pump fuel so the filter wouldn't be fully empty....it does work on suction....the lift pump pulls fuel from the tank to the filter.....if you remove the line running to the filter housing from the lift pump and crank the car....fuel should come out...

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Cartridge.

Also, I ran the car with the top off of the secondary filter to watch the line from the lift pump to the secondary filter housing and nothing was coming out, so as you stated there should be some fluid coming out, so I guess I'll lean towards the lift pump at this point.

It's got to be the lift pump or an air leak from the housing itself, but if what you say is correct, then I'll say lift pump, because NO fuel is going into the secondary fuel housing with the top removed to watch the flow.

ok, lets see a picture of your fuel arrangement.

with the top off, there will be no fuel flow, because there is no suction.
the top has to be on for fuel to enter the filter. in order for the filter to empty, there has to be a leak.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I don't follow that. Shouldn't the lift pump be pushing fuel into it or is the 115 system different? I agree that air has to get in for the filter to empty.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

that section could have an air leak in, vs a fuel leak out, since its on the suction side. Say for example one of the hard plastic clear lines had a crack in it. Would not necessarily leak fuel out, but the injection pump may suck air in.

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This post brought to you by Carl's Jr.

If the secondary filter had fuel in it and it leaked out, where did it go? That volume of leaked fuel should be visible.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

First off let me say, thanks for everyone chiming in!! I appreciate it!!

I will take and post a photo when I get home, possibly I can post a video also with the car running and doing different things to troubleshoot.

I just want to make it clear - the car runs beautifully with fuel in the secondary filter housing with the top on or off. The problem is the "suction pulling" the fuel from the fuel line after the lift pump into the secondary filter and allowing the free flow of fuel.

Now with the top off the secondary filter and the car running, suction or no suction, I would think that the lift pump would cause some fuel, even a little, to enter the secondary filter housing, even without the suction. Now that being said and being a novice I could be completely off base on that.

Now with the top still off and the car still running if I hit the primer on the lift pump, ample fuel spills into the secondary filter housing. That being said, I would think there are no obstructions leading to the primer/lift pump.

So two questions - Given the above scenerio with car running and all...

1 - Should we see even a little fuel spilling into the secondary filter housing even though there is no suction?
2 - Given the primer operates as it should, there are no obstructions up until that point?

Thanks once again!!!

Dwayne

The car is running, thus the filter is emptying into the motor.

The lift pump is shot.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

yes... I know where the fuel is going... but the reason more fuel from the tank is not replacing it, is there is a leak letting air in, instead of more fuel.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Thanks Vstech, just want to make sure we were on the same page.

Like I said I'll post photos when I get home.

Thanks all!!