Fuel pressure ramblings

[Don W.]

Everyone talks about idle FP, 40, 50 whatever. But I'm curious. What do you see as a WOT Fuel Pressure. Long story but I'm finally going install my Walbro. Right now, before the install, I got the FP cranked to 58 (engine off, fuel pump jumped.) However at WOT it barely makes it to, say, low 60's. It would almost seem that you could tune to WOT fuel pressure and let idle take care of itself, within reason of course. So anyway just wondering, thinking out loud as-it-were. It will be interesting to see what I end up with after the install.

 

[James Thomas]

Re: Fuel pressure ramblings

Well Im not sure about all AFPR's but I would think that if you are not running a 1:1 gain FMU setup that a 5-10 psi difference from no vacume base is about right (I see an 8 psi difference on mine) if all of your vacume connections are good and correct. With an FMU set up it's not uncommon to see double the base setting. On our blower 4.3's at full boost (12+ psi.) we see 78-80 psi on a 38-40 psi base setting. Sounds about right to me.
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James Thomas

 

[93 TY 2185]

Re: Fuel pressure ramblings

You should see about 1 pound of fuel pressure increase for every pound of boost.

HTH

 

[Don W.]

Re: Fuel pressure ramblings

I already knew about the 1 for 1 thing. I was just rattling on about what you folks are seeing for a top end fuel pressure. Appreciate it.