255 fuel pump pressure drop on 408
 

so my trucks getting road tested at the dyno shop and they said when they gear down at 60mph the fuel pressure drops to around 20 pounds, now i need to know what i can do. can i get a magnavolt? run a second 255 intank with a hobbs switch? is there a bigger intank pump out there somewhere?

very interested in this as well...I need to upgrade my fuel system too and want to do it right the 1st time...

add a 255, or go to a magnafuel or similar pump...

Spoolin mentioned one to me not long ago that I'l lbe trying once I need to upgrade. might want to hit him up and see what he knows.

Mine was doing the same thing after I upgraded turbo's. 40 was the lowest it went down to when my tuner was logging it though. I have a single 255 in tank, and I installed a Boost-a-pump and everything is working great. I'm assuming your injectors are sufficient enough for more fuel?

I'm using two intank walboros running at the same time with no issues. The bucket modding wasn't too bad and just drilled a small hole on top of canister to run power for second pump.

yea i got 60 pound injectors, will that magnavolt make my pump more prone to failing?? I want this to be done right, I'm almost thinking about doin the twin intank, anyone have a write up on how they did this

It all depends on how much power your truck is going to produce.
If it's under 500hp, a walbro and 60's should be enough.
If it's over, I'd look into dual walbros.

Is that fwhp or rwhp?

What's stock fuel pump rating, rwhp? with 42# injectors?

well i just got it dyno'd at westers garage in tilley up here, and they said their dyno isn't calibrated for elevation correction and some other things, so far, running a little fat for the first while, it put down 410 horse to the wheels and 400 torque. he figured so far it was 570 at the crank, i guess thats how much his chassis dyno under rates it???!!!

With that power, it looks like the fuel system will be ok.
Check out the idc next time, that'll tell you, keep an eye on fuel pressure too