I wanted to test the pump before installing it so I put the pump in a vice, mityvac'd to fill it with fuel, then put a socket on a drill (variable speed) to spin it over. Jar of diesel with hoses going to the in and out ports.
Its not pulling fuel, just makes a lot of air bubbles. In fact it seems to pull fuel normally when i rotate the drive shaft counter-clockwise (backwards), until the nut spins off.
This is very strange, I even re-opened the pump to check the vanes. Everything seemed in order, put it back together, same thing. I don't know what I did wrong, but something is. Put 12volts on the solenoid, no difference. How is it possible to only
pull fuel by turning the pump backwards?
its a reverse rotation pump?
It wasn't before I took it apart (lol) . from a 1.6 CR engine...
Double checked the banjos, out has the filter in it. It easily primes with the mityvac.
I know the vanes aren't stuck, threads about that are the closest i can find similar.
I must be way off
If you put the outer ring of the vane pump in upside down it reverses the flow direction.
I'll check that. Thankyou!
That was it! I flipped it over cleaning it, thought it wouldn't go in up side down being tapered... yikes!
Soo if we find a nice pump that was built to spin the other way;
we can fix that.
Reversing the vane pump isn't the only issue. The plunger is different also as is the drilling in the pump case to the dynamic advance piston.
I think the channels in the head are different too. Dieselmeken has mentioned EDMing them to go the other way, and I doubt he'd bother if you can just flip the ring.
My understanding is that the channels in the distributor head are the same. The channels are cut on the plunger different, tho, to prevent an engine from being able to run backwards. By rotating the plunger in the correct direction, the 'fill port' closes before the 'delivery port' opens. Regardless, the plunger and head are a matched set so it is fairly irrelevant which one is different.