Fuel pump: What would you do?

Birdie2000

Birdie2000

Club Member
Single external pump vs. multiple in-tank?

Let's assume a car that will see a fair amount of street time. Let's also assume that the external pump is designed for continuous operation and doesn't need a voltage controller.

Pros/Cons?
 
Already have a single external pump that I can/would use if I go that route.

Just curious from a general standpoint. Is one setup more reliable? Is there any reason to go with an external over say a couple Walbro in-tanks? Obviously the external will be noisy and the in-tanks won't.
 
Birdie2000 said:
Already have a single external pump that I can/would use if I go that route.

Just curious from a general standpoint. Is one setup more reliable? Is there any reason to go with an external over say a couple Walbro in-tanks? Obviously the external will be noisy and the in-tanks won't.
Click to expand...
Single external belt-driven is what I'm talking about though. Those things are about as robust as you can get and very quiet too.
 
What you got now ?

Birdie2000 said:
Already have a single external pump that I can/would use if I go that route.

Just curious from a general standpoint. Is one setup more reliable? Is there any reason to go with an external over say a couple Walbro in-tanks? Obviously the external will be noisy and the in-tanks won't.
Click to expand...
 
F car tanks are a bit tougher to get multiple intaks into.

Birdie2000 said:
Already have a single external pump that I can/would use if I go that route.

Just curious from a general standpoint. Is one setup more reliable? Is there any reason to go with an external over say a couple Walbro in-tanks? Obviously the external will be noisy and the in-tanks won't.
Click to expand...
 
The problem with high horsepower pumps is the amount of fuel that is flowing constantly through the fuel rails. With a big pump like a pro series it will constantly push so much fuel through the return system that your fuel will heat up very fast. The pump itself isn't what heats up the fuel, it's the constant travel through the hot fuel rails in the engine bay that make it hot. Over time the fuel will start to cavitate (especially if your tank is low) and that can cause serious problems. What makes a belt drive pump appealing is that flow is proportional to engine RPM and when your engine doesn't need it, it's not going to deliver too much fuel to heat it up. Another suggestion for if you run a big pump like an pro series is to run a voltage controller and a fuel cooler on the return side going back into the tank. If you run an eliminator then you could just get away with a controller to lower the voltage to slow the pump down when the extra fuel isn't needed.

Birdie2000 said:
Single external pump vs. multiple in-tank?

Let's assume a car that will see a fair amount of street time. Let's also assume that the external pump is designed for continuous operation and doesn't need a voltage controller.

Pros/Cons?
Click to expand...
 
Maybe a fuel cooler would be in-line then if I decide to use the pump I have. Product Engineering specifically says not to run a voltage controller with the pump I have and that it is designed to be run at no less than 12.5v and can be run on the street just fine. Product Engineering is basically a MagnaFuel pump in case anyone is unfamiliar.

The only thing with a belt-driven pump is that I have a supercharger setup and already have a bunch of shit strapped to the end of the crankshaft. Would be a pain in the ass to shove a fuel pump up in there too. Of course it can be done, but at what cost?
 
Just out of curiosity I have a question about that belt driven pump. I was reading their installation instructions and it says to mount the pump lower than your fuel cell, as is typical with any external fuel pump. So how would you do this with a rear-mounted fuel cell? I would think that no matter what you'd end up having a level or up-hill path for the fuel when running the lines along the floorboard/frame rail. I'm pretty sure that with my 15gal. aluminum tank that mounts in the stock location the pump would be higher than the outlet of the tank, or the fuel line would at least dip below the level of the fuel pump inlet.
 
As long as it is close to the same level you would be fine. For your setup an electronic fuel pump would probably be easiest. The mechanical fuel pumps usually mount close to the balancer area. Using a separate HTD belt with a mandrel off the balancer is pretty common.

Birdie2000 said:
Just out of curiosity I have a question about that belt driven pump. I was reading their installation instructions and it says to mount the pump lower than your fuel cell, as is typical with any external fuel pump. So how would you do this with a rear-mounted fuel cell? I would think that no matter what you'd end up having a level or up-hill path for the fuel when running the lines along the floorboard/frame rail. I'm pretty sure that with my 15gal. aluminum tank that mounts in the stock location the pump would be higher than the outlet of the tank, or the fuel line would at least dip below the level of the fuel pump inlet.
Click to expand...
 
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