Flexfuel sensor location
interesting, I haven't had an issues yet, honestly all I ever use is e85. I haven't reached any extreme power yet either. I'm only at about 550rwhp but after this louisiana summer heat passes I plan to add a second pump and a procharger on the truck so I guess I'll see how it works out when I go that route. My tuner that also owns a performance mechanic shop is actually the one who put my lines like that. I had them hooked up different and he switched them to the way they are now a few months back and he builds alot of cars with much more power then mine. The only thing he mentioned was switching the injectors and adding a second pump in which I already had that planned.
I'd imagine if your tuner runs it that way it's because he's learned that it works through trial and error which as far as I'm concerned, is far more valuable than theory.
If you think about it, not enough fuel supply is going to cause problems regardless of where the fuel comes in, if you have enough delivery then the layout should be inconsequential unless you really screw it up bad lol.
If you're looking at pumps on E85, take a look at the AEM pumps, they hold pressure higher way better than the Walbro 450 units.
TECH Fanatic
Joined: Oct 2022
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From: Louisiana
And you may never have any issues and honestly, I hope that you don't.
I'd imagine if your tuner runs it that way it's because he's learned that it works through trial and error which as far as I'm concerned, is far more valuable than theory.
If you think about it, not enough fuel supply is going to cause problems regardless of where the fuel comes in, if you have enough delivery then the layout should be inconsequential unless you really screw it up bad lol.
If you're looking at pumps on E85, take a look at the AEM pumps, they hold pressure higher way better than the Walbro 450 units.
I'd imagine if your tuner runs it that way it's because he's learned that it works through trial and error which as far as I'm concerned, is far more valuable than theory.
If you think about it, not enough fuel supply is going to cause problems regardless of where the fuel comes in, if you have enough delivery then the layout should be inconsequential unless you really screw it up bad lol.
If you're looking at pumps on E85, take a look at the AEM pumps, they hold pressure higher way better than the Walbro 450 units.
It's uncovering the sensor inside since it's not returning enough fuel, that's why you don't put it in the return line after the fuel pressure regulator unless you have a better computer that can latch ethanol content before going WOT. I have found the best place is after the fuel rails before the regulator so it's under constant pressure and is not a restriction feeding the rails. Or get one of those fancy Motion Raceworks flex sensor bypass units and just stick it in the feed line and not worry about it being a restriction.
I have mine in the return line with zero issues.
Given it's at the lowest point in the fuel system, and the fuel system is designed correctly, neither of which are by accident.
And there is a little pressure on the return side, not much though.
Given it's at the lowest point in the fuel system, and the fuel system is designed correctly, neither of which are by accident.
And there is a little pressure on the return side, not much though.
Nic, question. Sticking it after the fuel rail before the regulator, have you noticed and difference side to side, from possible fuel flow differences? I'm sure the junk I tune compared to you wouldn't notice or care, but I could potentially see it on a much higher HP situation where even the fuel passing the injectors is considerable. Thanks
