Help..fuel Pressure 91,

[Johnny G.]

What range should I be running at..I have no clue and I know it needs adjustment.
I believe the bottom end is a stock 302
I have edlebrock aluminum heads ,E 303 cam, gt40 upper and lower intake, 65 or 70 mm throttle body with spacer..bbk cold air..with mass air , 24lb injectors. my timing is set at around 15 -16°
I have a holley adjustable regulator. I want to install a gauge and adjust.
If there's anything info im leaving out that may help..just ask. I'd really like to get this car running at peak performance . thanks in advance

 

[mikestang63]

disconnect the vacuum line fro the fuel pressure regulator and plug it. I assume you have a gauge on yours? It should read between 39-41 with the line off and plugged.

 

[jrichker]

Fuel pressure gauge adapter fittings:
http://www.holley.com/products.asp?product=17945NOS AN 4 to 1/16” pipe
http://www.holley.com/products.asp?product=16785NOS 1/16” male pipe to 1/8” female pipe

Or
See http://www.autometer.com/cat_accessorieslist.aspx?pid=10

I made my own pressure gauge and holder. I bought the NOS or Autometer adapter that you screw into the place on the fuel line where the schrader valve goes. You have to remove the Schrader valve, but save it, since you will reuse it. I ran a piece of SS (stainless steel) braided hose to a 1/8” pipe brass tee fitting that I mounted on the fender well by the MAF. I made a mount bracket out of aluminum angle I got from Home depot and bolted it to the fender well. Then I mounted the brass tee to it with some machine screws and a plate. I sandwiched the brass tee between the aluminum angle and a flat piece of aluminum that I trimmed off the extra aluminum angle. Three screws laid out in a triangle pattern go through both pieces of aluminum to clamp the tee in place. Put the Schrader valve in the spare port of the brass tee. I used a cheap industrial gauge from MSC Direct (http://www1.mscdirect.com/ P/N 56468499). It works great and was cheaper than (less than $8) anything Summit had.

If you look through the MSC Direct catalog, you can find any type of gauge you want, including liquid filled. You only need a liquid filled gauge if you mount it directly on the engine. The liquid filling dampens out the vibrations. However there are a couple of people who have had nasty engine fires when the gauge or the fuel injector rail broke due to vibration because of the gauge directly mounted on the fuel injector rail.

You can buy the Autometer Stainless Steel braided hose for like $60. Or a local shop that makes hydraulic hose assemblies can make it for you at a cheaper price. Ordinary low pressure hydraulic hose can be used in place of the Stainless Steel braided hose, the Stainless Steel braided hose just looks nice. I got mine for $4 at a place that sells industrial and military surplus parts of all kinds. The Stainless Steel braided hose goes for about $4+ a foot and the fittings are probably about $6-$10 each. You can make your own and save some $$$, the shops may have a setup or labor charge to fabricate the hose assembly.

[

Safety device to prevent major fuel loss in the event of a failure of the hose, fittings or gauge...

 

[Johnny G.]

disconnect the vacuum line fro the fuel pressure regulator and plug it. I assume you have a gauge on yours? It should read between 39-41 with the line off and plugged.

thank u for reply. however I don't follow . It's adjustable but there's no Guage . I want to put one on tho. I think the vacuum line connects to the top of regulator . ..covering the adjustment screw? I just want guage..put on..measure and adjust .
Thanks for your help

 

[General karthief]

Yes the adjustment screw is under the vac line. They make a gauge that connects to the Schrader valve on the fuel line, its on the passenger side behind the alt. Unplug the vac line from the regulator and plug it, turn ignition to on, don't start, note fuel pressure, hopefully it will rise to around 40 or so, than slowly fall off, start the engine, note fuel pressure, adjust to 40 psi unplug vac line and connect to regulator. Pressure should stabilize at around 32 psi turn off engine let fuel pressure drop to 0 and remove gauge.
Do not leave gauge connected to Schrader valve, it will break and it will spray fuel and your car will burn to the ground

 

[Johnny G.]

What range should I be running at..I have no clue and I know it needs adjustment.
I believe the bottom end is a stock 302
I have edlebrock aluminum heads ,E 303 cam, gt40 upper and lower intake, 65 or 70 mm throttle body with spacer..bbk cold air..with mass air , 24lb injectors. my timing is set at around 15 -16°
I have a holley adjustable regulator. I want to install a gauge and adjust.
If there's anything info im leaving out that may help..just ask. I'd really like to get this car running at peak performance . thanks in advance

 

[Johnny G.]

Thank you my friend. that was extremely helpful.
If I may ask ..what would too high of pressure do..and also if too low. you say adjust to 40..but then it actually settles to 32..do I then just leave alone..or is there room for play and what would be the pros or cons?
Any advice would be great. thanks again tho buddy

 

[General karthief]

If your car is stock or even mildly modified there is no advantages to raising the pressure. When you hit the go peddle the regulator maxes out at 40 and thats all you need.