Dies at 3K
Hey guys,
Have a recently installed 400HP system on a 351C 4V. After the install, it started first turn and has always started and idled great. The car drives fine up until I hit about 3,000 RPM then it just completely falls flat, AFR will hit 20 and it will completely stumble to the point where it's not able to go higher. Doesn't stall, but completely falls flat and will barely run. On a couple occasions it would basically die out so it would only idle and any gas at all would have it barely run. Sitting on the side of the road for a couple minutes it would mellow out and at least let me get it home. That may have been related to having low gas and it sucking in some air as both times it was pretty low.
I've tried a number of different things, reset a few times from scratch and it's always the same. A few times, it has run perfectly for a minute, but that has been the exception for sure. Running a Walbro pump on a relay and have the PWM setting at 100% on the Fitech. The fuel system is basically the Fitech kit, but with the Walbro pump and relay. Fitech fuel filters and fuel line they provided etc.
It really just feels like it's not getting enough fuel as this seems really consistent no matter what settings I mess with.
I'd appreciate any help in debugging this.
Thanks
Alright dude, you need to have fuel pressure gauge near the fitech fuel inlet. Once you get that, then you can tell first if you are getting enough pressure during the times you feel you are not getting enough fuel, then we can go from there. One step at a time.
Thanks that's what I am thinking as well. I suppose I'll need rig up a gauge so I can read it up by the windshield or something since this only happens when it's driving.
Also, I am going to change out the fuel filters. The Fitech post filter looks like it should be serviceable, but doesn't actually look like it opens. Not scientific of course but when I blow through it, I'm getting a lot of resistance. I would think that even at 30 microns I should be able to blow though it pretty freely.
OK well feeling a little dumb. Yup, it was the fuel filter. Flushed it out with carb cleaner and running amazing again. The fuel pump was 2nd hand so hopefully it just had some crud in it and this was a one time thing and not a bigger problem with my tank. It certainly looks fine, but it's not new.
Thanks
I would still put on a fuel pressure guage at the fitech fuel inlet, just to keep track of things. You can look at it in park by revving engine to see if your fuel delivery is failing. I've had fitech internal regulators fail, fuel pumps fail, filters plug, and even the gauge go bad, so having one is critical.
https://www.amazon.com/gp/product/B0828CNGB7/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
Invest in a good gauge above, not one of the fitech gauges, those can fail.