3500 Upper FPR clearance

[whitelightnin04MC]

I've been reading a few threads, and I was pretty sure that I was going to have to grind down the neck on the Upper to clear the FPR, but I found a couple of threads with some other information. I plan to still use the plenum spacers and was wondering if I absolutely need the FPR adapter that is sold in the store. If it makes the jab that much easier, then I'd rather have it. I'm hoping to have the upper installed before the end of the month and I really want to make sure I'm not leaving anything out.

Thanks in advance,
Brian

[PCGUY112887]

Doesn't seem like you would need anything else if you were using plenum spacers?

[whitelightnin04MC]

I was going off of this thread:

http://60degreev6.com/showthread.php?t=36834&page=2&highlight=3500+FPR

With these pictures:

http://60degreev6.com/sappyse107/3500TESFPRsetup

[Superdave]

I'll see if i can get some pics of how i modified my FPR to clear the plenum..


I'm not using spacers but i bet it would work just as good...

[whitelightnin04MC]

Thanks dave, I appreciate it. Pictures always help. I'm looking for different ways to get it done, but I don't mind buying the adapter if I have to.

[Chris88CL]

I didnt need to grind anything and I didnt use any spacers.

I just undid the bracket bolt, rotated the FPR slightly and bolted it back up.

[IsaacHayes]

Chris, did it leak any or did you take it out and put new o-ring and lube?

[ForcedFirebird]

I just checked a 3400 fuel rail on my 3500 top end and it's tight, but clears. I just sent off a 3400 top end, so I don't have it to compare to. Either way, you can put an aftermarket FPR in the return line if it is a problem.

[whitelightnin04MC]

I didnt need to grind anything and I didnt use any spacers.

I just undid the bracket bolt, rotated the FPR slightly and bolted it back up.

That's just it. I have the plenum spacers, which I still plan on using in conjunction with the 3500 Upper. This causes the hat on the FPR to be in the way of the plenum neck.

Either way, I've got some options. I've got the adapter from Ben and I also have the pictures from Superdave which show how to mod the FPR bracket to make it work.

[Chris88CL]

No I didnt have any leakage issues. I ALWAYS use new O-rings anytime I take apart the fuel system. If the injectors come out, they get new O-rings too. $5 in O-rings is a worthwhile investment. Engine fires SUCK.

I think even with the spacers my regulator would clear. I understand what you are saying though. Maybe I have a factory freak, I dunno. I havent had any issues in about 7,000 km's of driving it like this.

Maybe it's an L-body thing. I'd get pictures but the engine is completely disassembled and most of it is at the machine shop at the moment.

[IsaacHayes]

Yeah I put new injector o-rings in. And don't take them out when I don't need to (LIMG just leave the fuel rail on the LIM). But the fuel line disconnect by the firewall I never changed and they never leaked. I heard the FPR was known for leaking if you mess with it so I was wondering on that. I bet it will be hard telling the parts store you need an o-ring for that... probably have to bring it in to match up.

It could be an L body thing, I think from the pictures I've seen some FPR brackets look different on older/newer 3x00's. Or either just showing more or less of it in the pictures. Not sure.