1.8L CIS K-Jetronic injection problems

[Anonymous]

syncro is right, but it won't necessarily cavitate if the pressure is too high. If a new pump is noisy in the car it can be a sign of cavitation hence my earlier comment on the lift pump. If the pump cavitates it will not last very long. I am not familiar with the diesel fuel tank in a Mk1 but it is important that the roller cell pump is gravity fed with fuel and not trying to suck fuel from the top of the tank as it would in a Mk1 carburettor tank. The pump is not designed to suck fuel which is why a lift pump is used in some installations where it is not possible to draw fuel from the bottom of the tank. The diameter of the fuel feed pipe from the tank to the pump is important too and there should be a pre filter (100 micron) fitted between the tank and the pump.

[Roscoe]

oops, thought I had signed in. that last post was mine.

[Peter Jones]

The Fuel Line from the tank to the pump is a 13mm. The pump sits beside the tank and is lower than the pipe coming out of the tank. There's no filter between the tank and the pump. There didn't seem to any problems gravity feeding fuel from the trank to the pump it certainly flowed out on the garaqge floor quick enough when the vice grips came off the fuel line! More investigation required.

Pete

[sydneymk1]

u say its noisy and draws to much current.
this is an old pump right?
sounds like its polling- this means internal bearings worn out and the spinning part of the motor catches on the stationary part
where u from i could lend u a spare benz one just to test it out

[Peter Jones]

Yep, I've pretty much come to that conclusion. Thanks for the offer of a loaner, but I've got a brand new one on the way. I'll let you all know how it works out!

Pete Jones