Best inline fuel filter for E85. (Having problems with junk getting in needle & seat)
08-21-2014, 09:16 AM
#1
Best inline fuel filter for E85. (Having problems with junk getting in needle & seat)
Hey guys, I recently made the switch to E85 blow through carb. See sig below. I still have my summit fuel filter I used when my combo was N/A. I'm running -8 supply and return lines. I seem to keep having problems with junk getting in my carb causing it to dump fuel and run rich. I know the ethanol is breaking down all the grit that the gasoline left behind. I'm looking for a cheaper but better solution for my new combo. I am really unsure on what the micron numbers mean. Thoughts?
08-24-2014, 07:57 PM
#2
Supreme Member
Re: Best inline fuel filter for E58. (Having problems with junk getting in needle & s
The micron rating is the LARGEST diameter particle that the filter will allow through. Smaller number, smaller particles.
With a blow-through setup I assume you are running some sort of electric pump back by the tank (or in the tank) with a boost-referenced regulator under the hood. Generally, you want a large-micron filter BEFORE the pump and a small-micron filter up by the carb. The fuel pump can handle much more junk in the fuel than the inlet valves before there is a problem. The carb needs CLEAN fuel- very little grit and contaminants- to function properly.
If you are using an in-tank pump, the "sock" on the pickup IS your large-micron filter. If it's external to the tank, you need an in-line filter before the pump, IN ADDITION TO the fine-particle filter up near the carb.
All fresh braided lines, new tank and new (home-welded) sump on that tank, I DESTROYED an Aeromotive A1000 pump in a matter of minutes on a friend's blow-through carb'ed Chevelle because I thought I could get by without an appropriate filter in front of the pump. I figured the filter up by the carb would be enough. Wrong. All the junk from assembling the fresh tank, pickup and lines wrecked the pump, completely clogged the front filter and stuff STILL got into the needle-and-seat assemblies on the carb, causing the same problem you are having.
Fixed everything, ran a couple gallons of fuel through the system using the (newly repaired) pump to wash out the remaining crap. Fired it up and all was good. Changing the filters (front and rear) after a couple minutes of run time revealed EVEN MORE junk collected in them! It was like some sort of nightmare. But the next filter change after that, everything was finally good.
The amount of crap in new fuel system parts is something I will NEVER underestimate again!
Obviously, EVERYTHING in your fuel system must be rated to work with Ethanol if you are running E85.
With a blow-through setup I assume you are running some sort of electric pump back by the tank (or in the tank) with a boost-referenced regulator under the hood. Generally, you want a large-micron filter BEFORE the pump and a small-micron filter up by the carb. The fuel pump can handle much more junk in the fuel than the inlet valves before there is a problem. The carb needs CLEAN fuel- very little grit and contaminants- to function properly.
If you are using an in-tank pump, the "sock" on the pickup IS your large-micron filter. If it's external to the tank, you need an in-line filter before the pump, IN ADDITION TO the fine-particle filter up near the carb.
All fresh braided lines, new tank and new (home-welded) sump on that tank, I DESTROYED an Aeromotive A1000 pump in a matter of minutes on a friend's blow-through carb'ed Chevelle because I thought I could get by without an appropriate filter in front of the pump. I figured the filter up by the carb would be enough. Wrong. All the junk from assembling the fresh tank, pickup and lines wrecked the pump, completely clogged the front filter and stuff STILL got into the needle-and-seat assemblies on the carb, causing the same problem you are having.
Fixed everything, ran a couple gallons of fuel through the system using the (newly repaired) pump to wash out the remaining crap. Fired it up and all was good. Changing the filters (front and rear) after a couple minutes of run time revealed EVEN MORE junk collected in them! It was like some sort of nightmare. But the next filter change after that, everything was finally good.
The amount of crap in new fuel system parts is something I will NEVER underestimate again!
Obviously, EVERYTHING in your fuel system must be rated to work with Ethanol if you are running E85.
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