hello, I have the fuel coming into the side and return on the bottom..right? vacuume line hooked up, got good pressure all the way up to the regulator, pump is working and all, but no fuel going through the regulator, any ideas?


thanks
nick

 

check the adapter for the return line. when i got mine, it was too long and was keeping all the fuel from returning. file it down to the threads and you should be all good

 

You need O ring boss fittings for that regulator, they are flat on the end. You can't use flare fittings.

 

For the sake of clarity, do you mean that you have no fuel pressure at the regulator or no fuel is making its way to the return line (and you'd have a LOT of pressure at the regulator.)


And Spoolin's right. You can grind the regular -6 to -6 fitting down to the threads and toss on an o-ring. You don't need the o-ring boss fittings but you DO need an o-ring.

 

no fuel making its way out of it. good fuel pressure at the regulator.

 

What everyone else has said is right. You need to make sure you are not using a beviled fitting....it must be flat. Either buy a flat Boss fitting with an O-ring or take your fitting out and grind it down to about 1/16" above the first thread and put an O-ring on it and it should work fine. Also, check the fitting on the feed line to the side of the FPR, it also can not be beviled, it must be flat as well. When you pull out a beviled fitting, look inside the FRP and you will see a small circle indention from where you have tightened the fitting into the FPR and no fuel could pass through like that. But if you have pressure in, more than likely it is just the return fitting, but I would check them both just to be positive.

 

What is the psi at the regulator? If no fuel is getting out then your pressure will skyrocket. If your pressure is normal then either your pump is bad or fuel is getting out.

On the other hand if you have used the wrong fitting on the inlet the FPR itself may not be seeing any pressure at all. What does the pressure gauge read?
Where is the pressure gauge attatched?

 

No....I don't believe that is true. If it is blocked up, pressure will only go so high and then the pump will quit pumping fuel into a full line. The schraeder valve can only handle so much and it should just hold the pressure at a constant psi once it reaches such a psi.

 

Please elaborate lane change. If you pinch a line the pressure will spike up, on my car to 100 psi. There may be something about this in the shop manual about a test for this, can't remember for sure.

So if you are saying that it will only go so high, I agree. Maybe the word skyrocket in my previous post was a poor choice of words for this.

 

thanks everyone, it was the fittings, works great now...thanks

 

Take a garden hose for instance......pressure can only go so high. If you stick your thumb over the top of the hose, pressure will build up until a point, and then it will reach same pressure as the spicket is spraying and then quit. Same with fuel....the pump can only pump so much psi.....once it reaches that level, it has no choice but to stop.....it is not like the fuel hose is going to stretch or explode....so it will reach a certain psi and won't be able to go any higher. There won't be any spikes or skyrocketing.

Ever tried to pump a truck tire up at a gas station.....the pump only has 60psi of pressure....so once your tire gets to 60psi, they balance out and the pressure remains constant.