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The amount of fuel injected into each cylinder is very precisely metered and must be equal (under any given set of running conditions) for each cylinder.

Fuel pressure along a length of pipe will decrease as the pipe length increases and this affects the quantity of fuel that will end up being injected.

For this reason the fuel injector pipes are made to equal length.

The effect of unequal pipe lengths would be uneven engine running and reduced performance. In the short term, whilst this effect might go unnoticed by many users, the long term costs (increased wear, more frequent maintenance and greater fuel consumption) would be hard to ignore.

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Q: Why do diesel injector pipes have to be the same length?
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