Re: Lucas CAV pump help

Posted by Ultradog MN on December 07, 2020 at 12:46:16 from (172.58.83.175):

In Reply to: Lucas CAV pump help posted by old560 on December 07, 2020 at 08:58:55:

Here is a write-up I made on another board.

"I don't claim to be a pump man but my guess is the problem is your metering valve.
On those CAV pumps it is rather common for them to get stuck in the off position.
Here is a post with a picture I put up on another forum that explains how to free it up.
It has helped many guys get their tractor started.
"First of all CLEAN your pump and its surroundings.
Pressure wash it then use brake cleaner.
You do NOT want any dirt inside.
Shut fuel off at the tank.
Remove the throttle rod and shut off cable.
Cut the wire that has the lead seal on it.
Remove the two nuts that hold the top cover on the pump. There are washers under the nuts. Do not lose them or your cover will leak.
Carefully lift the cover of the pump about 3/4".
Do NOT overstretch or remove the spring that is attached under the cover.
The photo below shows the pump backwards from what you will actually see. Note the slide bar #3. That will be right in front of you when you lift the cover. That slide bar operates the metering valve. See the red arrow. Metering valve has a very weak spring that should return it forward to run position. They get stuck in the off position. Free it up with a small screwdriver or popsicle stick - move it back and forth till it returns forward on it's own.
Get the slide bar located properly - that can be tricky so use due care. Replace the cover. Replace the washers and nuts.
Some say you will ruin the gasket under the cover when you do this. I have done this a half dozen times and gasket was always fine.
Turn on the fuel and bleed the filter/s. Bleed the pump. Crack all 3 injector lines at the injectors, turn the engine with the starter and bleed them all simultaneously. Then retighten the injector lines . It should start then.
Remember this pic is backwards.
It really is Very simple to do so don't be scared of it.
Let us know how it goes."

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