If the clutch is in any useful shape at all, you should be able to stall the engine when idling in 2nd by putting a foot on the brake and engaging the clutch.

If the clutch is slipping, it will smell like hot brakes as the friction warms it, and RPMS will increase but speed will not. This is a bad thing because it can change the temper of the flywheel if it gets it hot enough.

While it revs in idle, this takes hardly any fuel, as there is no load.
A few things I would look for or check;

Air binds
Kinked fuel lines, check all the way from the bottom of the tank to the engine.
Rusty fuel lines (rusty fuel lines can suck air)
Tank strainer
Clogged tank vent
Check the throttle linkage, make sure it delivers a full stroke to the input lever on the injector pump.
Spring on the lift pump overflow.

If there is no alternative fuel involved, John please move this to DD.

If there is an alternative fuel in use, please clarify.

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82 Benz 240 D, Kuan Yin
12 Ford Escape 4wd

You're four times

It's hard to

more likely to

concentrate on

have an accident

two things

when you're on

at the same time.

a cell phone.

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