Just wondering what you guys have for fuel pressure.
I have been having issues with my truck lately.
2003 f-350 king ranch 6.0L
8 months ago I swapped in 2 injectors that were used but still good. #6 & #8. So the truck ran good for a bit then on a long haul I started noticing a little power loss but I thought it was me. Then last month my truck acted up and I still haven't found the issue. Truck wouldn't start warm so I thought oil leak. Then the day I added oil dye it started warm and I had no issue. Drove it and all was good.
Next day it would start and run for 5 seconds. Then die.
Did this 3 times. 4 th time I revved it up and it ran.
So I scanned the truck. Ficm voltage was good, ICP and IPR checked out.
Only issue was cylinder 8 contribution.
I had put a blue spring in my truck few years ago so I thought fuel pressure was good.
Someone on this forum told me to check my fuel pressure.
So I rigged up a Gauge and holly crap.
40-45@KOEO
45-48@KOER
50-60@1500rpm
Below 40@2500rpm
Below 30@3500rpm
The truck recently started smoking black.
The pump is growling louder than usual and surges like its sucking air when it's at KOEO and after the injectors cycle.

Now I know why injector 6 and 8 went and now why cylinder 8 is having issues.
I am running a powermax turbo and a edge 100hp chip.
Soon a sct custom tune. Have egr delete and arp studs.
And a AFE 4" down pipe back exhaust.

Am I beyond the limits of the stock pump?
I want a airdog II and a back of the head regulator
What is the best bang for the buck

 

sounds like you fuel pump is going out

with stock inject your OEM fuel pump should be fine (Yes I know you tuned)

Most folks dont need to do regulated returns untill they install bigger injectors

 

Awesome. I wasn't sure if it was good enough. And through my company I can get a discount on the pump.

I have now learnt a valuable lesson.
With a 6.0l assume nothing. Test it and know it!
I will be adding a set of gauges or a edge cts insight to my truck. So I can see this **** happening.

Truck justed rolled over 300,000 km so the fuel pump is no big deal. Better than a HPOP or HPO leak.

 

Did you change fuel filters??

When you check Fuel pressure UNLESS you have the special adapter you must check at WOT

Optimal fuel pressure is 60psi

sounds like its ATE a few injectors low fuel press is a Injector KILLER

 

Isn't 3500 rpm pretty wide open? Or do you mean it has to be under load to see the FP drop. I'm only asking Benny, 'cause I just threw a BS in my regulator w/o checking pressures before or after....

 

You can easily get above the capability of the stock fuel pump running a hot tune, even with stock injectors.

 

2500-3500rpm is where the powermax makes its power.
I think that 4000 is redline. Not sure exactly what the rpm was. Could have been 3250. I was watching the fuel pressure drop when I was driving it.

 

I don't think I will ever run a tune that hot. But with a gauge in the truck I can see if the sct tune will drop fuel pressure.

 

I like this video....

 

what a great video... thanks for posting.

 

100 hp edge tune is hot enough, but I think that video says it very well. That's why I'm a strong advocate of fuel pressure gauge FIRST.

 

OK Good to Know

 

I just bought a new stock fuel pump.
Could have paid for half a new performance fuel system.
But I need the truck running and I'd be waiting a few weeks to get a fuel system from a supplier.