Wednesday, Jan 30, 2013 at 12:50
fairdingkum
These are things I am aware of.
The OE filter should be sufficient for the vehicle re micron size so the addition of a second filter actually makes it the additional filter the first filter after the tank
An Isuzu Dmax flows flows around 35 litres/hr and has a filter which can handle aorund 70 litres/hr Isuzu figures with a fuel reg pressure of 6 to 7psi.
Your engine is 50% bigger and so can use proportionately more flow rate and fuel usage.
A very fine filter ie 2 micron is wonderful to have but it has to be very large indeed so as not to restrict the normal expected flow rate when it becomes a bit blocked with"stuff".
Although you can fit one of these fine 2 micron filters you may be changing it every fortnight. Not cost effective. It also should dewater the fuel as much as possible because that will damage things before the crap gets through any filter.
If you fit a pre filter which catches contaminants and dewaters and also has a micron size of 5 to 10, then it will remove all the" blowfly" sized particles and whatever gets through that will then be filtered by the OE filter. This leaves the oe filter to do only a small cleanup job and not the pick and shovel work.
Therefore the pre filter has to be of appropriate size in filter area and dewatering performance.
As mentioned recently, I use a P902976 Donaldson filter kit for
mine which has a flow rate of 114lph. Two of these paralleled will give128lph and a slower fuel passing through rate and a lot of filter area to catch crap and far greater ability to dewater than just one filter. This also ensures negligible restriction to the ultimate flow rate the pump can produce while maintaining filtering and dewatering before the OE filter.
This leaves all original water and restriction sensing still operational as normal.
There are other filter setups available but most are three times the price too. Nothing is perfect but having something is insurance.
If you can eliminate some of the water by a Mr Funnel before it hits your tank, then that is more insurance, but it doesn't stop emulsified water in the fuel at all so the dewatering + filter is handy to have.
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