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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
"I assume that this is the bolt that runs the fuel through the fuel head and back to the tank."

That banjo bolt is running the fuel from the CPR and the lambda valve through the middle part of the system fuel pressure regulator only. It's not going through any other part of the fuel head. The fuel pressure regulator is actually two seperate fuel presure regulators. The little skinny one in the middle is the one we're talking about here and it holds some fuel pressure in the CPR return line and lambda valve line leading up to it so the fuel system will hold 35 psi which is the fuel injector crack open pressure after shutting off the engine and fuel pumps over night or a little longer so the car will start faster next time you want to drive it.

If that little pressure regulator wasn't there then fuel pressure from the fuel pump check valve to the fuel injector pintle would drop to zero the moment the fuel pumps shut off.

The larger outer part of the fuel pressure regulator in the fuel head is what maintains system fuel pressure around 85psi in the early cast iron fuel heads and around 98 psi in the aluminum lambda fuel heads while the fuel pumps are running.

When removing the lambda valve you screw a 10x1mm plug into the fuel head where the lambda valve connected to the lower chambers and you take the short 10x1mm banjo bolt that was there and switch it with the longer 10x1mm return line banjo bolt the CPR and lambda valve return line banjo fittings were piggy backed on.

"If they both drain to the same bolt, wouldn't a mulfunction in one effect the other as it raises resistance down stream?"
Maybe.. I don't know.
Old 11-18-2014, 10:19 AM
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