yes he does (return).
stock (fpr).
on the fuel pump in the tank, your guess is as good as mine what the crazy ****** is doing. He has an OEM intank now, he may just replace with and OEM but he may also put the time into dropping a walbro 255lph in there. He also has an inline pump...it will now be a walbro 255lph also...if he ever sent the wrong one back. He has enough goodies to HAVE NO fuel issues for sure!!!

There you go, a page from the Holty diary.

 

hehehehe, 255 walbro in-tank is going in as soon as i finish typing this. i'll post back later today with results.

 

The fuel pressure in a return style system will vary depending on engine load. The FPR not only sees boost but, it also sees vacuum and adjust fuel pressure accordingly. At idle there is a lot of vacuum on the manifold which will lower the fuel pressure. At WOT there is no vacuum(NA) or boost(blown of course) which will raise the fuel pressure. This is normal operation for a manifold referenced fuel pressure regulator like the '03 and back systems use. The numbers you posted earlier are not out of line from normal for a '03 system. The dip in pressure at WOT was not right though.

The '04+ "returnless" fuel systems should hold a relatively constant fuel pressure under all loads(assuming the fuel volume is available)

 

alright, the 255lph walbro in-tank pump is in. so far, so good. only one weird thing happening....key on, engine off, my fuel pressure jumps to about 56psi, then drops back down to 0psi. it never did this before,....key on engine off always bleeded off just a few psi, but never went down to 0....is this normal? otherwise, everything is good so far. WOT = 62psi, other than a higher WOT psi, everything else is exactly the same. right now i have 3/4 tank of gas, we'll see what happens as fuel level goes down. here are some pics.




NEW OEM GM fuel pump assembly:


modified stock fuel pump assembly:

 

Good deal. It sounds like the 255 doesn't have a one way check valve in it so basically once it stops "priming" the fuel just drains back through it into the tank. The only thing that might cause is a little bit of extra cranking on startup but, shouldn't be to big a deal.

I would've said it was a regulator problem but, your fuel pressure sounds good so that isn't it, must be the check valve deal.

 

thanks dude, i figured it was something simple like that.

 

what are you expecting from the square hole in your fuel pump bucket?

 

sorry, i'm not sure i understand your question?

 

looks like you cut a hole on the side of your basket, why did you do that?

 

i had to modify the bucket since the factory fill system no longer functions as designed. With the stock pump it had a pickup directly underneath the bucket which was connected to the pump to fill the bucket so the pump could just draw from the bottom of the always filled bucket to feed the motor. This was designed to keep the pump always in the fuel to keep it cool and keep fuel completely around the pickup so no air could be sucked in around hard corners or acceleration. since the new walbro pump does not have that extra pickup, i need to cut the bucket open to allow fuel in to keep the pump cool.