K-jet has it's own learning curve, and can involve a specialized fuel pressure gauge that allows you to monitor fuel control pressure as the car warms up, but basically, I have found 2 things go wrong.

1. The control pressure regulator has probably failed, if you are getting bad mileage or stumbling running. New ones aren't cheap >$150. Old ones don't work. (YMMV).

Replacing the original with new involves updating to a 240 style. The 140 style had a barbed fitting on top, permanently affixed to the control line from the fuel distributor. If you still have this, it is disassemblable for cleaning, but like as not, it will not work correctly again.

The 240 style CPR has a banjo fitting for the top, and these fittings are fun to find. A hydraulics supplier might be able to direct you to the correct Parker part numbers. Most of the Volvo stuff is for 5/16 hose. YOu will probably have to go up to 3/8 hose and fittings, but then you can use normal HP rubber fuel hose instead of the original nylon type. See the notes the online parts suppliers put in with the 140 CPR. something like "requires upgrade kit".

2. The hard warm start is caused by a failed check valve at the fuel pump. This is also tricky to fix, since it is a barbed fitting into the same type of nylon hose, must be done with heat. The hose is commonly used as air brake hose, but the check valve I haven't tackled yet, and I just deal with a hard hot start. Porsches and mercedes used a lot of k-jet, and putting a check valve up near the fuel distributor seems to solve the problem, but that means dealing with more high pressure hose fittings and adapters.

The fuel distributor is probably okay.

Run a can of SeaFoam fuel system cleaner through 1/4 tank of gas. YOu might get lucky.

If you fuel pump is running pretty smoothly, it's probably okay.

The Haynes manual should have a supplement chapter for k-jet.


Good luck. It runs great when finally sorted out, though, and requires nothing thereafter.

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MPergiel, Elmhurst, IL '74 145e T-5 'Orange Alert'

Also look in the 700 series FAQ, it used virtually the same K-Jet stuff. A wet injector could be a leaking injector. But your problem sounds like maybe the control pressure regulator. I'll see if I can dig up info, both my 760 and 240 had K-Jet and I should have info somewhere (lost most of it when I sold the cars). But the 700 FAQ would be a good starting point.

Yes, it's K-Jet.

Check for air leaks, a slight leak will affect the idle & off idle more than anything. The big concertina hose that connects the manifold to the metering assembly on top of the air cleaner can get cracks in it, take it off & have a good look.

The leaking injector isn't too much of a problem for power, but a new set never hurts. I'm not sure how helpful that would be to your second problem.

Yeah control unit under the seat would definitely be Djet. Yours is Kjet. Other than that you'll have to wait for an answer from someone more experienced with the mechanical fuel injection, I only know the electronic.
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And in the near future Lola 2.0