When you install the Walbro pump, you must remove the restriction at the fuel return line after the stock fuel pressure regulator. It is the 'U' shaped piece bolted to the block under the manifold. The fuel line goes from the fuel pressure regulator down to this U shaped section of metal tubing and then to another rubber gas line. You can either drill out the end of the metal tube or just bypass it with a metal vacuum/gas line coupling. Make sure you use clamps. This restriction will cause a rise in fuel pressure of about 6 or 7 psi which will probably cause your car to run too rich. I just ran my lines from the hard line from the tank directly to the fuel pulsation damper, then from the fuel rail where the old regulator was to the new AFPR and then out the bottom of the regulator to the hard return line. It takes a little fabrication and a few fittings but gets rid of some clutter and kind of cleans up the engine bay a little. The next thing to do is install a new Adjustable Fuel Pressure Regulator ( AFPR). If you plan on running much over 12 psi, it is a must.Posted by someone at some other forum does any body have pics of the instalation proces.
Walbro help...
- Thread starter LEGNA
- Start date
Check my thread on doing the fuel system.
http://www.supramania.com/forums/showthread.php?t=13579&highlight=fuel
http://www.supramania.com/forums/showthread.php?t=13579&highlight=fuel
You don't actually have to remove the restriction after installing the Walbro. I've been running a few years on the original j-tube and Walbro with no problems. You also don't need an AFPR over 12psi, it's a good idea but in no way required. I've been running 16-20psi every day for the past few years on a 57 trim on a stock fuel system with the exception of 550cc's and a Walbro. There are quite a few people doing the same thing with no ill effects.
