Reg return and still dropping pressure?

[da94broncodude]

Just finished installing regulated return fuel system as well as a couple other mods and still my fuel pressure drops from 80 to 20psi on a WOT burst, anyone else have this problem or is there something i missed?

 

[STROKER]

Have you checked your filters? Could be the Stock HFCM failing

 

[faster6.0]

stock lift pump joey? 80 psi is way to high for the regulator, 65 is plenty.

 

[da94broncodude]

yeah stock hfcm, cleaned the crap out of it last time it was out and filters arent very old, lowered set psi to 65 but it still drops to 35 or so

 

[STROKER]

If you do want to replace the hfcm i a working one that came off my truck with less than 5000 miles on it.

 

[da94broncodude]

priced one out from ford today 250 bucks, id be interested for the right price and if you want to guarantee i wont be in the same boat with yours

 

[STROKER]

Well I can't guarantee that's your issue but im positive my HFCM is good. How bout 150 shipped to you, if it doesn't work you just pay to ship it back.
-Mike

 

[faster6.0]

I got an extra HFcm I'll send you bud if you want to cover shipping. Otherwise an a-1000 for 299 is the way to go

 

[da94broncodude]

JJ you are the man! ill text you tomorrow about this, Stroker i will let you know the results and if this doesnt work i may be purchasing yours

 

[Mdub707]

What gauge are you using and where are you reading pressure from? What fuel filters are you using? The new OEM one's or the old one's?

 

[da94broncodude]

Im using an autometer c2 reading pressure from the test port on the fuel filter housing, and using the new oem filters

 

[wetnsloppy4x]

I just noticed something. You just installed a RR, but your sig says you have an "updated fuel pressure spring". That's gone now, right?

 

[da94broncodude]

i installed a GDS spring that took the psi to almost 90 and regulated it down to 65

 

[wetnsloppy4x]

The spring and poppet should not be in place in the factory regulator housing with a RR.

 

[Strictly Diesel]

Multiple regulators in a system can be a problem. It would help us diagnose your problem if you could give more information about the RR kit. Just saying "RR Kit" isn't enough, I've seen people call things an RR kit that were not even close. If you built your own, maybe some pictures and description. If you purchased a kit, let us know which one.

Also, what fuel pump?

 

[da94broncodude]

i built the regulated return myself based off a write up on tdg, basically i have lines coming from the back of the heads to an aeromotive regulator and it goes from there to the factory return housing and is tapped in, i dont have pics of mine but here is a similar setup (person i got the writeup from)

he used a .125" thick by .5" o ring on the inside to keep the plunger closed, does that sound right? i havent done that yet but will if i need to

pump is stock hfcm

 

[chappy]

You shouldn't have a spring in the housing if you are running a regulated return. The regulator does the job the spring use to do.


https://www.dp-tuner.com/index.php/aitdownloadablefiles/download/aitfile/aitfile_id/97/ go to page 6 and tell us if you left that poppet installed. Is that the plunger you are talking about you left in?

 

[wetnsloppy4x]

:whs:
That popett is fighting the RR to control pressure.

Just a tip, I'd either cap or run a hose from off the top of your motor from the reference port on that regulator. If that diaphragm ever ruptures you're going to have a mess of fuel on top of your motor.

One other thing, is that NAPA or WIX oil filter cap I see? If so I'd ditch that filter and go back to Motocraft filters asap.

edit: See the post that is currently right below. http://www.powerstrokearmy.com/forums/showthread.php?t=13723

 

[Keanoknick]

i built the regulated return myself based off a write up on tdg, basically i have lines coming from the back of the heads to an aeromotive regulator and it goes from there to the factory return housing and is tapped in, i dont have pics of mine but here is a similar setup (person i got the writeup from)

he used a .125" thick by .5" o ring on the inside to keep the plunger closed, does that sound right? i havent done that yet but will if i need to

pump is stock hfcm

:whs:
That popett is fighting the RR to control pressure.

Just a tip, I'd either cap or run a hose from off the top of your motor from the reference port on that regulator. If that diaphragm ever ruptures you're going to have a mess of fuel on top of your motor.

One other thing, is that NAPA or WIX oil filter cap I see? If so I'd ditch that filter and go back to Motocraft filters asap.

edit: See the post that is currently right below. http://www.powerstrokearmy.com/forums/showthread.php?t=13723

Yeah it appears to be a WIX cap, but that's not pics of his setup.

 

[chappy]

I missed that part as well lol.