I got a Walbro 400 and a new off brand fuel module/pump/bucket assembly. Obviously I'm going to remove this pump and replace it with the Walbro. I'd like to install the pump without cutting the bucket in order to keep the fuel in the bucket to prevent the pump from starving and for better cooling. Is this possible?

The stock pump has two ports on the bottom while the Walbro only has one. The port on the stock pump without the sock goes to the center of the bucket which is connected to the sock external to the bucket. The sock on the pump just hangs out inside the bucket.

What is the second port on the stock pump for?

When I submerge the bucket in water, water will flow in through the rubber check valve in the corner and the one in the very center after going through the external sock.

So I guess my question is, can I just toss the Walbro in the bucket with its own sock? Or do I have to cut the bottom of the bucket and let the Walbro stock stick through?

 

The sock goes outside on the module abutting the base of the fuel tank. You will lose the stock Venturi system.

Regardless, there are no starvation or cooling issues with the install as I have done it.

I'm currently in the process of installing dual 450s. Let's just say there won't be much of a bucket left. I have no concern. If you run your turbo truck down to E that's your own problem.

 

Why do I need to have the pump and sock sticking through the bottom of the bucket? Will it not work if I just place the pump in the bucket?

What is the venturi system? How does it work?

 

Put the pump in the bucket and make sure the fuel return hose points to the bucket and youll be fine. Just dont run it down to E.

 

Where does the stock return fitting go?

 

There's three ports, one is the feed, I'm assuming one is a vent and the other is the return. Looks like the return dumps right back into the bucket, doesn't connect to anything.

I try not to run it down to E but occasionally I do/have to.

 

OK, I think I understand how the venturi system works now. So the Walbro doesn't have the venturi port meaning that the bucket will not fill with fuel as quickly? Without the venturi, the only things filling the bucket are the return line and the check valves in the bottom of the bucket.

So, if the engine is using more fuel that what is coming back from the return plus the fuel coming in through the check valves, the bucket will run empty. Did I get that right??

So cutting holes in the bucket is the only way to ensure it doesn not run empty, but, the holes also let fuel drain out of the bucket which can be problematic at low fuel levels.

 

Unless you are wot for a long long time, I don't think you would ever empty the bucket with the return filling it.

 

On my factory fuel pump module the sock was outside the bucket.

Also, the return feeds through one of the metal legs of the assembly to the base of the bucket.

 

i have my 450 sticking out the bottom of the bucket with the sock on.

only time it fuel starves is if its riding on E and you take off hard from a stop.