Im trying to bleed my fuel system after frybrid install.

My question is how should I bleed the system. I added a bunch of fuel line, solenoid valves, and re-ordered the system.

I am trying to pull a vaccuum from just before lift pump (which is now the last thing in system before IP) all the way back to where fuel soft line meets the hard line on the frame rail in the engine bay.

Its not able to hold a vacuum, which I think means it will let air into fuel system. Im not sure how much air can be leaked into fuel system before the engine stalls. To go from 20" HG to zero takes about 20 or 30 sec. I think the leak is somehow in the diesel fuel filter housing.

Can anybody offer suggestions how to purge air from lines on my OM603 (1987 300D Turbo) ??

__________________
Paul
Benz-less
I need an SDL !

a2t,

1.'Check ALL the fuel line clamps (twice).
2.'Using a "Mighty Vac" or it's equivalent "pull" the fuel from the newly sealed
lines up to the "lift" pump.---quickly re-attach the line and "bleed" the system
by loosening the caps on the individual injector lines whilst you "crank" the engine.

Do you really need to bleed the system?

After changing fuel filters on the 300SDL, I used to floor the accelerator and crank the engine. It took about ten seconds but always started. Keep it floored and it will eventually start.

I suspect most of that delay was filling up the large (spin-on) fuel filter with diesel.

Of course, this was a standard OM603 which ran on diesel not WVO. Not sure how much extra you've plumbed into the stock system.

Neal

__________________
'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)

Thanks for replies.

I found 1 leak - the threads on the return hose banjo fitting on diesel fuel filter housing were leaking. Replaced crush washers and put sealant on threads. Now we pull vacuum on diesel side and it holds.

On to the WVO side...

__________________
Paul
Benz-less
I need an SDL !