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Old 11-25-2010, 03:26 AM   #1 (permalink)
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Chug - '96 Volkswagon Polo CL
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VW diesel mechanical injection Heads up

Just had a bit of fuelling issue - a while back i had a leak from the injector spill-offs well the replacement 'get you home' ones that the RAC (like the AAA in the states, but ours is approved Her Maj) put on were so good I kinda forgot about them until this week when one rubbed through on the sharp edge of the injector. This filled the car with the pungent whiff of Shell's fuelsave Diesel, Pipe changed the car still stank and hand become lumpy and lacking in torque. Problem? the one pipe the RAC guy didn't change 5months ago was the spill-off return from inj4 back to the pump. TBH it looked and felt old, it even fell to bits as I removed it as it had a big hole in it and was dripping fuel into a nice dark part of the engine I hadn't noticed before. All this meant my FE dropped from 49MPG to 48MPG (shocking I know!)

Moral of the story – don’t rely on ‘get you home’ items other than to ‘get you home’ AND check all pipes in the system not just the ones leaking at the time. A length of Spill-off pipe cost about $4/yard and makes a hell of a difference to the feel of the engine – so its going to become a service item on my car and I’d recommend it to anyone else with a Mechanical injection VW diesel.

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Old 11-25-2010, 05:16 AM   #2 (permalink)
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Quote:
Originally Posted by robchalmers View Post
This filled the car with the pungent whiff of Shell's fuelsave Diesel,
Have you ever seen an improvement in FE while using this stuff ?
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Old 11-25-2010, 08:49 AM   #3 (permalink)
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If you can check the break off pressure on those old injectors. It was about 1800 PSI on the same era Mercedes.

Typically the springs inside the injector assemblies get weak and the break off pressure drops to 1500 PSI which makes it run ruch and smoke due to poor atomization. You can shim the springs or replace them to get the pressures back up. That will get you better mileage and reduce the black exhaust smoke dramatically IF your pressures are low when you test them.

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Old 11-25-2010, 10:14 AM   #4 (permalink)
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Chug - '96 Volkswagon Polo CL
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90 day: 49.42 mpg (US)

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Quote:
Originally Posted by euromodder View Post
Have you ever seen an improvement in FE while using this stuff ?
Nope, but there is a agrage on the way to work that sells it as cheap as the super markets! so atleast i know I'm get reasonable quality dino juice

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