hi guys,

i am stumped..........

car has 212k miles and i had starting issues for a while 3 weeks or so, and also which i think is best desribed as a dead pedal for a while.

like you push it in 40% and nothing happened after that eventually it came to live. it sounded like fuel starvation which it turned out to be but that wasnt all................

so today i installed a new filter and verified i had good fuel flow into the ip. then i was going for a test drive, i made it out of my driveway but only to my next door neighbor, then it stalled and no more restart. so had to push the beast back home, no fun.

so, i do not have any leaks whatsoever, all upgraded with viton, delivery valves etc. i took the line which feeds the ip off to check, and there is plenty of fuel going into the ip, yet it still wont start...........

so at my witts end i cracked an injector and voila no fuel coming out. aha, but what the heck ????? no wonder it wont start anymore

is my sov bad ?? or whatelse could it be ?? and where is the sov located. the attached pic is what i believe the pump i have, but i am not 100% certain.

just now i looked at what my pump, it does not seem to be idendical.

on the back it has this brownish round thingie like in the pic, it has 2 wires connected to it.

then going forward a golden round something with no wires or anything attached to that i can see, but it looks different to the one in the pic. this might be the altitude compensator.

further forward a roundish black plastic looking gizmo which has a vacuum line attached to it. this might be the sov.

or the sov is maybe the thing in the back, brownish with 2 wires attached.

oh, also i should mention the car has about 50k veggie miles.

greets

reiner

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"oh, also i should mention the car has about 50k veggie miles."


Go looking for threads by Olivier, nothing new, another one on the way out.

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1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

i do have plenty of inlet pressure going into the ip, just not getting a drop at the injectors.

if i would a diesel has to run veggie or not. right now its switched to diesel anyway................

That is good, from what I have read the injector pumps do not like veggie oil.

the rotary pumps are a bit tricky, like the dodge cummins 98 up they use the vp44. they can die easily when low inlet pressure is present. but the in line pumps are very tolerant.

i think i now know what shuts of the fuel, the black looking thing towards the top in this pic. i have that on my ip as well. it has a vac line attached and i assume it shuts of the fuel supply once vaccuum is applied. so maybe mine is stuck, thats what i am thinking.

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Mercedes uses the VP44? Are you sure about that? If so the VP44 is very picky, If fuel pressure is low the VP44 will fail.

no mercedes does not use the rotary vp44, i just mentioned this one as being very failure prone, just ask any dodge 98 and up driver.

but some mercedes in europe i believe used some rotary models.

the inline ips are considered virtually bulletproof.

Well two tests I would perform before going further. Fuel coming out the return line on the injection pump when cranking? If so clamp or close that line off and try to start. Chance of fouled relief valve open all the time. Then move on to the shut down mechanisim if the above checks out okay.

ok just now i just checked again if i have fuel at the injectors. put a clean t shirt underneath the removed line so i can have a visual and low and behold i seem to have at least some fuel arriving at the injector, its very little from what i can tell but definetely some.

also checked the return and i have return flow as well but its hard to tell where it comes from since 2 lines come together = from the injectors and the relief valve. i will see if i can isolate it to the relief valve.
or i can pinch the main return and try starting it.

so i will keep messing with it...................

so i do have a little fuel arriving at the injectors, but its hard to tell for me how much it is and or if it is enough.

we have it 65 f here in florida, car is outside in the driveway.

my glowplugs are ok. on top of it i heated the engine via heater.

i clamped the return shut, cranked it and not even once does it fire. thats impossible, yet a fact. what the heck is going on ?????