Thread: Parts are in for fuel line replacement

Just got all the stuff to replace the nylon/plastic portions of the fuel lines. I also picked up a fuel pressure sending unit.

I think a write-up is in order.

I'll get a few more pics during the install, but here is basically what is involved. This will replace the plastic portions of the send and return fuel lines in the engine bay. I have the ZZP fuel rails and FPR. For stock rails, see note at bottom.

From the feed line, start with a Swagelok adapter that converts 3/8" hard line to AN -6 male, part no. SS-600-6-6AN. I bought this from a local place for around $10.


That connects to a female AN -6 braided hose end. Jeg's has these in black and blue/red in various angles, I used 555-110001 in black.


About 3 feet of braided hose is needed for the feed line, and 3 feet for the return line, so 6 feet total. Got that from Jeg's also. Pro-flo 200, 555-100911. The feed line connects direct to the zzp rails with another AN -6 braided hose end.

The return line comes out of the zzp fuel pressure regulator. I have to remove the stock line adapter from the regulator and install a 1/8" NPT to AN -6 adapter. Jeg's 555-100102.


Braided hose and ends goes back to the return hard line. The AN -6 is converted to 3/8" NPT with Jeg's 555-100106.


The return hard line is 5/16". Swagelok does not make a direct adpater to 6 AN for this size, so a coupler is used to make the connection to the Swagelok adapter. The coupler is Jeg's 3/8" NPT 555-100422


The return line is finished off with Swagelok adapter that converts from 3/8" NPT to 5/16" hard line. Part no SS-500-1-6, around $10.


The fuel pressure sending unit is from VGauges.com.

I also picked up a 1/8" NPT tree from them to install the sender into the FPR gauge output. This sending unit requires 5v power, so a 7805 regulator from Radio Shack is needed on the power line.

NOTE: If you want to do this replacement with stock fuel rails, you will need a couple more parts. The feed line will need an adapter for the GM quick-connect fitting. That is Russell part no 799-640850.

The return fitting is Russell 799-640860. Jeg's carries both.

I'll want a lot of info. Doing a top swap, the L36 lines are kinda awkward to go on the L67 rails. I thought of replacing them to make it easier and this is something that could be useful.

This is great info, perhaps if you do a write up on putting everything together we can get this over to the How To section. I for one have been wanting this kind of information for a while, but Im doing mine from the tank all the way up.

Please post install pics, i need to do this soon... I'm curious where your going to start the braided line at? Under the car? PIcs please! :-)

Definately interested I have been wanting to do my complete system for a while and your part #'s definately simplify it ,THX.

Originally Posted by Iron Indian

Please post install pics, i need to do this soon... I'm curious where your going to start the braided line at? Under the car? PIcs please! :-)

The braided line starts right under the brake booster. That is where the stock hard line from the tank ends, and there is a section of plastic or nylon hose. I'm not too worried about the hard line back to the tank, but you could replace everything with braided. Just a lot more $$$.

This pic is from Dave Wild's replacement:


The main reason I was upgrading was to get rid of the GM quick clips. I never liked those things, and I always think they are going to leak. Since I have the ZZP rails, I can run AN all the way through and there is no more need for the clips. I also will be happy to get rid of the plastic lines, because I think over time they will degrade.

I also did this recently. Got a PRJ regulator adapter and installed AN lines. I accessed the lines in the drivers wheel well once you get them free from the plastic retainers.

Originally Posted by kamper98

I also did this recently. Got a PRJ regulator adapter and installed AN lines. I accessed the lines in the drivers wheel well once you get them free from the plastic retainers.

Got pics? I have PRJs too...

Here are the pics of my set up. I am running ZZP rails with the PRJ regulator. I dont have any of where i connected to the hard line.

Did you get the fuel pressure sender installed? If so how do you like it?

Originally Posted by Andrew_99GTP

Did you get the fuel pressure sender installed? If so how do you like it?

Not yet. I'm still trying to figure out where to put the 7805 regulator that steps down the voltage. I don't want it to short on anything. I just installed a ported s/c and N* TB, so I'm still working on some tuning also.

Did you use a gauge from vGauges, do they look like a quality setup? I am thinking about going this route seeings how they offer all the gauges I want and they would all match.

Originally Posted by Andrew_99GTP

Did you use a gauge from vGauges, do they look like a quality setup? I am thinking about going this route seeings how they offer all the gauges I want and they would all match.

I didn't get the gauge. I just want to monitor pressure in my HP Tuners scan software, so the sending unit will just wire into the HPT unit.