CAV V's STD fuel filter

Gday Andrew,will ask them tommorrow seing as I work there!!!!

Glad I only had nice things to say about them!

Hi Desert, I'm interested in how/why he got an improvment in power and economy by putting in the extra fuel pump??

The injector pumps on a 1HZ are a rotary design and they actually use about 4 times the volume of fuel that the engine uses. The other 3 parts diesel are used to lube and cool the pump then returned to the tank (Which also means your fuel is filtered many times before being injected in the cylinders). So if the motor is starving for fuel you will have bigger problems than a lack of power. This is also why you shouldn't run your tanks low all the time because the recirculating fuel (especially in summer) gets warmer and warmer and obviously can't cool the injector pump as well.

Anyway, I may be missing something but I can't see how more pressure/fuel to the pump wil make any difference.

Yes, I was sceptical too at first and could not see any reason for any increase in performance or economy. But his figures are genuine, so much so that I am going experiment with my Nissan and see if I get similar results.
I believe that the injection timing is pressure dependant or rather, is susceptable to fuel pressure within the centrifical advance mechanism. This somehow alters the timing and/or advances the timing which would account for the performance increase or horsepower increase and the subsequent fuel savings come from having to lift off the throttle due to more power available. Of additional importance is the instance of longrange tanks where the extended fuel pick up pipe is enough to make the pump struggle to lift fuel and maintain pressure on the lift side of the injection pump, prior to the fuel entering the high-pressure side for injection. Thats the only way I can account for it. After I have fitted the pump to my own truck I'll re-post the results.

Yeah I can see some reasoning in what your saying. Please let me know how your trial goes. Just sounds too simple. Bit like one of those "can't lose" investments. Ha Ha. Lets hope your successfull.

I've a CAV on my HJ61 and would really prefer to have a screw on type filter. Aligning all the seals, filter, glass bowl and bottom plate is really awkward as where I have the unit mounted I have to lean over and do it all from the top of the filter. They key I guess is to mount it in a place where you can access it easily - but a spin on would be easier.

Ryco told me, via email, their R2132P for use in the CAV unit is rated at 15 micron nominal at the start of it's life. I'm not sure what the difference is with something thats not nominal, and am assuming it filters finer as it gets to the end of it's life, but 15 micron is fine for me, pardon the pun. I got it to extend the life of my main filter.

An aux electric pump would make priming easier, but I'm running a cheap $2 plastic filter, the CAV and the main filter AND using vege oil and the standard lift pump is sucking away quite happily. That said, I am planning to install an electric aux pump to make it all work easier.

Tim