Ok so here is the story. The motor was rebuilt about 3000 miles ago replace damn near everything. I put a walbaro fuel pump in it, primed the engine and then started. I then noticed a puddle on the ground on the spark plug side of the motor. I looked at the fuel lines seemed not to be leaking. So I moved the car and let it idle to see if the puddle was there already and it didnt leak one bit. So just to make sure I primed the motor a bunch Like I did with the new walbaro in and still bone dry.

Car ran great after that drove it for a while then one day it had a hesitation under load. I was low on gas and thought I was running out so I went and got gas and it still had this problem. I wanted to replace the walbaro since I didnt like it, so I bought and rx7.com pump and threw that in. Went to prime the motor and again it was leaking when primed. I started it and it continued to leak. It was for sure on the under the manifold toward the drivers side. At this point I had to go home and figured I would deal with it tomorrow.

So today I went to tear my manifold off to diagnose. Before I started I wanted to make sure I couldnt find it without pulling the UIM and now no fuel leak as before primed and primed and nothing. Started and let idle and nothing, revved and nothing.

I am now stuck with a car that runs great but am scared to drive any ideas?

-Chance

 

Look into replacing your FPD, Fuel Pulsation Dampener. It's right in the area you're talking about on the underside of the manifold. Can you smell any fuel though it "appeared" to stop leaking?

 

This is what I thought at first but the fuel pulsation dampener is a few months old and no There is no smell of fuel what so ever now that it quit leaking.

 

If I where you, I'd replace all the rubbers lines with SS lines. At the same time replace the PD. The cost of replacing, will be minor to a burnt FD. Just my thoughts. CJ

 

Clamp the return line closed, ( be careful not to damage the hose ) then run the pump by jumping GND and F/P in the diagnoses connector. This will give you max pressure and make the leak more obvious. Then tear into it and get it fixed.



Paul

 

When the motor was rebuilt were the injectors o-rings replaced? It could be leaking at the injectors.

 

Make sure you have a fire extinguisher in the car and dont mess around with this problem. I have seen too many burnt FD's already.

 

Yeah I agree with the person above... Use a vice grips (not tightened all the way down!) and gently pinch down on the return line. You can use some rags to protect it from getting messed up. With the line pinched like that, running the fuel pump (engine OFF, just run the pump ONLY) should result in around 100 PSI of pressure - enough to expose any leak while it sits in your driveway.

HAVE AN EXTINGUISHER HANDY and don't leave it like that for long at all. You just want to spike the pressure up, then turn it off and see where it leaks.

 

Injector O-rings were replaced.

thanks for the help guys. I will prime the system like you said and hopefully it gives so I can track this down.

 

I would do what Brian (Wargasm) suggested. You need to find the leak rather than replacing pumps and stuff. Take care with the fuel.

Brian, it's good to see your'e still around.

Dave