1994 940GL with Bosch fuel system

I'm going to embark on the job of changing my fuel filter and replacing the crossover pipe between filter and pump which is a copper pipe and all twisted up. (Doesn't look original - uses a male/male nipple threaded into the filter, and the copper crossover pipe has female/female fittings)

I've read in other postings that air tools are the best idea as regards fuel line fittings (banjo bolts). Presumably this is because they do things up tight nice and quickly without the same risk of twisting the filter or the fuel line around. Correct ?

I've borrowed an impact driver that looks like the one pictured on this link:

http://www.toolprice.com/product/6786F

Is this the sort of tool I should be using ?
The box on mine quotes a ULT Torque at 90psi of 75 ft lbs
What does ULT torque mean ?

75 ft lbs seems a lot for a fuel line fitting. What is the torque recommendation on the banjo bolts into the fuel filter ?

I assume I can use the little adjuster wheel on the driver to reduce the torque (?) but how do I know what torque setting it is set to ? (The wheel has a scale of 0-8)

My other concern is of fuel squirting out everywhere when I loosen the fuel line fittings. I'm going to use a Mityvac and apply a vacuum to the fuel pressure regulator - that should depressurise the fuel line shouldn't it ?
How much fuel should then leak out ?


John Marshall
1994 940GL
Christchurch NZ