K-Jetronic tune-up Part II -- Accumulator and Fuel Pressure Regulator

[blkprlz]

Originally Posted by 180 Out

This information from my post of July 1 is all wrong. The fuel goes from the tank to the fuel pump, then to the accumulator, then to the fuel filter, and then forward to the engine. I wish this forum allowed editing, to eliminate stupid misinformation like this.

Kind of surprised no one caught it, I posted the IPB of the assy. from Eurospares in post #10 but...
A picture speaks a thousand words.
As far as edits are concerned, I don't think too many use it by all of the misspelled words that's posted out there (not just Fchat but all forums). I'm thinkin' that F-car owners should be a little better than that. You do have some time to edit your post (an hour or so I think) but no forum that I know of will allow you to edit your post days & weeks afterwards. I find 'preview post' to be very effective.

[180 Out]

Originally Posted by blkprlz

Kind of surprised no one caught it, I posted the IPB of the assy. from Eurospares in post #10 but...
A picture speaks a thousand words.

I'm thinking you all are taking it easy on the newb.

[kliko312]

For those interested, a good place to get parts for K-Jetronic systems:

http://www.kmipetrolinjection.co.uk/...K-Jetronic.htm

[180 Out]

Moving along with this K-Jetronic tune-up Part II -- the Larry Fletcher way: recall that the fussing with the fuel accumulators was a preliminary to checking, and possibly correcting, the at-rest position of the airflow sensor plate. In order to do that step, first we need to check that the control pressure is holding steady with the engine off. Verifying that the fuel accumulators are holding system pressure was part of that preliminary work. The other part is verifying that the fuel pressure regulator is holding control pressure.

To check the operation of the fuel pressure regulator, first you run the engine so that the WUR has warmed up to its normal operating temperature. When I performed my pressure checks I found that this takes between four and five minutes. Then you remove the fuel return line from the base of the fuel distributor. It's the biggest banjo fitting. If you're standing at the driver's side of the engine bay, it's located at 6:00 on the driver's side fuel distributor. In the first photo below I have put a box wrench on the correct banjo fitting.

After you've removed the return line, what you're looking for is fuel dripping from the return line's hole in the base of the fuel distributor. The second and third photos show a bit of this fuel escaping out the hole and adhering to the base of the fuel distributor. What you want to do is count how many drips fall from the fuel distributor. There should be at least five seconds between drips. If the drips are falling more often than that, then the fuel pressure regulator is not sealing properly and the system isn't holding control pressure.

In my case, there were no drips at all. The accumulation you see in the photos never increased to the point where there were drips.

The fourth and fifth photos show the passenger side. The fitting on this side faces toward the center of the engine, so that it's at 12:00 if you're standing at the passenger side of the engine bay. The story was the same over here: a little fuel came out at first, but the accumulation did not increase and there were no drips at all.

I conclude that both my fuel pressure regulators are working.

[Ak Jim]

You should open up a shop specializing in this system! Look like you are becoming an expert, good job and thanks for keeping us updated.