Fuel sample valve - need help

ss3011 · 02-21-2019, 05:45 PM

Is this the type of fuel system that doesn't have a fuel return up in the engine compartment ? I think the factory had the return and possibly the regulator back by the fuel tank . You may want to re-engineer that so it is similar to the old LT1 , which regulated fuel pressure on the return side of the fuel rail . Once you do that , the fuel sample valve will be easy to plumb in . That will then be similar to how I plumbed up my Oldsmobile Quad 4 .

Ed Wright · 02-21-2019, 08:18 PM

I have my fuel sample valve tapped into the fuel return line on my LT1. I also have a button near it, to push to run the pump for filling the fuel sample cup. Just a universal starter button. Both under the hood. Quick, simple fuel sample.

Mark Yacavone · 02-21-2019, 11:29 PM

Mike, You should have a pressure test port there somewhere.
This is how I did it on the Monte. I removed the Schrader valve and adapted an AN type fitting that changed everything over to 1/8th pipe. Then the sample valve on a tee and then onto a braided hose to the cowl mounted pressure guage, which you're going to need anyway. Yes, also an under the hood mounted fuel pressure relay feed switch.

picture share

Mike Meier · 02-22-2019, 03:58 PM

Thanks all for the replies.

We wound up doing what Mark suggested.

And now I know for the next one. LOL

Larry Hill · 02-24-2019, 09:47 AM

I use a stainless ball valve off of the regulator. I have used same ball valve since the 1990's

02-21-2019, 05:45 PM	#1
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 908 Likes: 70 Liked 238 Times in 113 Posts	Re: Fuel sample valve - need help Is this the type of fuel system that doesn't have a fuel return up in the engine compartment ? I think the factory had the return and possibly the regulator back by the fuel tank . You may want to re-engineer that so it is similar to the old LT1 , which regulated fuel pressure on the return side of the fuel rail . Once you do that , the fuel sample valve will be easy to plumb in . That will then be similar to how I plumbed up my Oldsmobile Quad 4 .

02-21-2019, 08:18 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Fuel sample valve - need help I have my fuel sample valve tapped into the fuel return line on my LT1. I also have a button near it, to push to run the pump for filling the fuel sample cup. Just a universal starter button. Both under the hood. Quick, simple fuel sample. __________________ Ed Wright 4156 SS/JA

02-21-2019, 11:29 PM	#3
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,789 Likes: 2,881 Liked 5,077 Times in 1,935 Posts	Re: Fuel sample valve - need help Mike, You should have a pressure test port there somewhere. This is how I did it on the Monte. I removed the Schrader valve and adapted an AN type fitting that changed everything over to 1/8th pipe. Then the sample valve on a tee and then onto a braided hose to the cowl mounted pressure guage, which you're going to need anyway. Yes, also an under the hood mounted fuel pressure relay feed switch. picture share __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers Last edited by Mark Yacavone; 02-21-2019 at 11:35 PM.

02-22-2019, 03:58 PM	#4
Mike Meier Member Join Date: Dec 2001 Location: Webster, TX Posts: 317 Likes: 121 Liked 39 Times in 8 Posts	Re: Fuel sample valve - need help Thanks all for the replies. We wound up doing what Mark suggested. And now I know for the next one. LOL __________________ Mike Meier "World's most expensive DF/S" 2007 Chevy Cobalt....because suffering through owning an AMC Stocker wasn't enough

02-24-2019, 09:47 AM	#5
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,614 Likes: 1,898 Liked 10,655 Times in 2,211 Posts	Re: Fuel sample valve - need help I use a stainless ball valve off of the regulator. I have used same ball valve since the 1990's __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817