running a couple tanks of pump gas takes care of the film build up. never had a problem from the modded walbro's i ran in my last car.

 

Will the Walbro 400 work with the factory fpr ? I was reading somewhere they said it would not work for certain gm cars without going to an aftermarket fpr.
I've been running e85 for the last couple years and 15,000 miles, I'm guessing any thing from build up from the regular gas should have been filtered out of the tank by now ?

 

While were on the topic then, what do some of the more experienceed f/i people recommend?

I know the factory flex fuel pumps can support quite a bit of horsepower with the fuel pressure modulation they have built in. I looked them up, and the delphi pump isn't very cheap, unless you can get it without the bucket, lines, fittings, etc.

Are there good known aftermarket pumps that can support e85 without issue?

 

I had good luck with real NOT China Walbro 255s. I ran one for 8 yrs for 50k miles on pump fuel and 25k on E85 with not one issue.

 

After allot of research on many different forums it appears the am340 is not compatible with e85. It seems the brushes wear, clog up the fuel filter and kill the pump in a very short time.
Looks like the Walbro 400 is the best option ? Anyone put one of these in there truck ?

 

depends on budget honestly. id run a surge tank setup and forget about it till you crack 600whp.

 

I know y'all are past this but I've been running 2 aeromotive 340 pumps for awhile now and haven't had any issues

 

I'm definitely not past it.

What's your set up? Factory lines? Filter? Etc.

 

i have like a yr and some months running e85 with dual aremotives intank stealth and no problem just change my fuel filter every 6 mo

 

The only thing factory is my tank ... #8 feed line - #6 returne - inline micron filter - 1/2" rails - 103lb inj - and two dedicated 12 volt power supplies on 30amp relays - boost refrense regulator ..