I'm placing a filter on the frame but have two choices, one is 60 gallon per hour and other is 90 gph pre filters to remove sediment and water before entering a new Raptor 150. Being that the 60 gph filter is shorter I need to know if that is adequate on a stock truck. There is conflicting information on the 5.9's requirements all over the net.

 

Sorry Mike, I know you said 90gph before but, I'm just hoping for any degree of clearance under there and with info on the net the way it is, well....

 

Update: I just ran my other truck without the 60 GPH filter it has always had, its a 12 valve, to see how much effect it has on restriction (fuel pressure). The fuel pressure only went up by 1 p.s.i. at best.

 

Then you figure burning say, to be on the conservative side, hauling heavy 14 miles to the gallon doing 60 miles each hour, so that's only burning 4.28 gallons an hour. Then add in the return flow on average, guessing must be about 30 gallons an hour. I'm still well under the 60 GPH rating the filter has when installed. That leaves room for heavy uphill hauling etc. However ,the debate then is how much return flow is actually required sense it is usually a constant flow always further polishing the fuel, which might be as high as 60 gallons an hour so then a 90 gph filter is required.

Edited April 6, 20178 yr by JAG1

I would be skeptical running a 90 GPH filter on a 150 GPH pump, so the 60 would be a very bad idea IMHO. 

 

The pump will move as much fuel as required to maintain the set pressure and if you see your pressure drop than means the pump is maxed out on its GPH for that pressure. 

 

While the 150 GPH will be rated at 0 psi for 150 GPH it will have the ability to outflow the 60 GPH filter quite easily, when a filter is out flowed you not only restrict flow but you also reduce the filtering capacity, and you're doing so at high power levels when the pressure and flow demand better filtration than cruising around. 

 

A clean filter shouldn't have a noticeable restriction. 

 

The 100 GPH Raptor with a 90 GPH filter is a much better, and cleaner, combo. If you haven't installed the 150 yet I would return it for the 100. 

 

If clearance is that much of an issue then consider mounting your pump/filter higher. 

 

But a long story short... the 90 GPH is the smallest filter I would run on a 150 pump, and you should probably go bigger. 

 

Most people run too small of filters for their pumps, but that doesn't make it right. 

The 150 is installed with the 60 GPH filter. When first fired up (no leaks in new fuel system BTW) I had to turn the pressure down from 25. Factory says they set it for 18-19 before boxing for shipment. Anyhow I got on it and found no pressure drop at all. Filter is on the suction side. I'd better put the taller 90 gph filter on for now from what you say.

 

Thanks for the info AH64ID.

You also have to factor in the fact Raptor does not have a return line. So reaching 150 GPH is not going to happen. The most I've seen so far in fuel consumption rate is 25-30 GPH. Now the typical highway flow rates are 1-5 GPH roughly. Then you have to figure in the return flow rate but since the body of injection pump limits the flow of return. 

Return flow is likely in the 25-40 GPH range. As supply pressure goes up so does return flow. 

 

The in tank LP needs a bigger, not by much, than 60 GPH filter. 

 

While you won't hit 150 GPH at 15 psi it would not be hard to exceed 60 GPH. Flow must increase to maintain pressure as the burn rate increases. There is also a loss of resistance as burn rate increases which also demands more flow to maintain pressure. 

 

The higher pressure requirement of the VP will cause a higher pump flow than a CR motor at lower pressure for the same burn/return rate. 

Edited April 7, 20178 yr by AH64ID

Both filters act together and create restriction and fuel pressure. I doubt the factory's smaller filter, being also smaller micron,  is anymore than a 60 GPH filter and would perhaps be more likely to fail than a good Racor filter

 

What you all are saying is a 90 will buy more time before having to be changed.

 

 

Edited April 7, 20178 yr by JAG1

There is more to it that just restriction. When you exceed a filters flow rating you actually decrease the filtration efficiency since you're forcing more fuel thru than the media can allow. 

 

You may or may not get more life out of a 90 GPH filter as life is based on the dirt holding capacity and not flow. 

 

The OEM filter for 00-07 is rated at 59.97, but only 24 for 98.5-99. The severe duty filter kit filter is rated for 63 GPH. 

 

Edited April 7, 20178 yr by AH64ID