Fuel Leak From Port on Engine

[gzaharatos67]

Hi everyone,

Really odd fuel leak problem here. Never encountered this one before.

74 Camper type 4 engine, rebuilt recently and added an electronic fuel pump and new dual Weber's

Today I noticed gas dripping out of a port on the lower passenger side of the engine. I think that screw originally holds the thermostat bracket in. How in world could gas be coming out of it?

I checked my oil and it's way overfull. Doesn't smell like gas, but has to be in there.

Yesterday I was checking my blinkers and had the key on for about 15 seconds. The fuel pump was running. Could this have flooded something out?

Where should I begin?

Thanks for the help everyone.

[gzaharatos67]

I just drained the oil. Ton of gas was in there. Current have a clamp on the hose from the tank.

[pioneer1]

Usually that indicates a stuck needle or float in a carb
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[aeromech]

You say you installed a new electric fuel pump. The ones for carbs should put out about 3-5 psi. The ones for fuel injection put out around 40 psi. Even if you installed the correct LP pump, it's still a good idea to use a pressure regulator between the pump output and the carb inlets. Reduce the pressure to about 2-3 psi for Webers. Obviously, your carb needle valves are leaking.

So you aren't running a thermostat I guess. Looks like the boss for the cable roller is where your oily gasy mixture is coming from. Better plug that threaded hole at the very least.

https://www.amazon.com/Holley-HOL-12-804-Pressure-...amp;sr=8-2
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[germansupplyscott]

As well as fixing whatever is filling the crankcase with fuel you should consider a safety relay for the fuel pump. It triggers and switches on the pump once the engine is cranking/running and prevents the pump from running with the key, as it seems your does now.
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SL

[gzaharatos67]

Yes I will be putting a relay in ... Unless I just go back to my mechanical pump.

I will also plug that threaded holes for sure.

It's the correct psi pump. Got it from my local VW guys here in Denver.

They also said I'd be fine not running a thermostat as long as I screwed the flaps open. I was ok doing that since I won't be using the bus much in the winter.

Ok, gonna look into stuck needle valves and see what I find. Thanks guys.

[Wildthings]

Yes your float is likely leaking through, the carb is always subject to some fuel pressure due to high tank and gravity even when the pump isn't running, this varies by pump design. Having a fuel shut off is good as is having a Marine Anti Siphon Valve in the line between the tank and the pump.

You need to plug the hole with a bolt and soft washer.

[Wildthings]

[babysnakes]

I had the problem with 34ITC's. I installed a fuel shut off solenoid similar to desertbusman (does anybody remember DBM?).

DBMs setup.

[aeromech]

That's a pretty clean installation for a white boy
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[babysnakes]

[gzaharatos67]

Replaced needle valves in both carbs and that seems to have taken care of it. Still a few things to do before I'm ready for the road, but this helped.

Thanks all!