Fuel pressure twin carbs Options

[JFG]

I have a 1.7engine and will be running twin Weber 40idf's.

My car was originally a 2.0i but came minus engine and ancillaries. The only thing I have is the original 3 port pump. I haven't tested it yet but I won't be running a return so can't use the pumpin this instance.

What kind of pressure should I be running the carbs at? Research and past experience (albeit not with 40's) would suggest something in the range of 2.5 to 3.5 psi.

Anyone with this set up have any input/advice on pump and flow pressure?

[brant]

Your experienced numbers are still good.
But I always recommend a return on carbs also

[74ravenna]

Your experienced numbers are still good.
But I always recommend a return on carbs also

I just installed the fuel pump for carbs that i purchased from CFR but i hadn't planned on running a return.

Why are you in favor of doing so?

Thanks
Steve

[SirAndy]

I just installed the fuel pump for carbs that i purchased from CFR but i hadn't planned on running a return.
Why are you in favor of doing so?

Keeps the fuel cooler and helps prevent vapor lock from boiling fuel in the lines and float bowls.
(IMG:style_emoticons/default/smile.gif)

[914Mike]

I just installed the fuel pump for carbs that i purchased from CFR but i hadn't planned on running a return.
Why are you in favor of doing so?

Keeps the fuel cooler and helps prevent vapor lock from boiling fuel in the lines and float bowls.
(IMG:style_emoticons/default/smile.gif)

I had to add two spacers under the manifolds to keep the fuel from boiling in my 2056 with baby Webers. I seem to remember a pressure regulator with a return, but could be wrong about that.

Any thoughts on leaving the FI pump under the tank when trying out some carbs? I want to just add the facet pump in the stock location, maybe run a switch to the FI pump to use for priming the system.

I'm just not sure if I can pull fuel through the FI pump when it's not running, or if irt would hurt the pump.

[SirAndy]

Any thoughts on leaving the FI pump under the tank when trying out some carbs? I want to just add the facet pump in the stock location, maybe run a switch to the FI pump to use for priming the system.

Plenty of thoughts on both and them thoughts are not positive ...
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- Don't use the FI pump for carbs! It's a high pressure pump and trying to use it is asking for all sorts of trouble, most notably a burnt out 914!

- Don't use a facet pump! They're noisy and most importantly, they're crap. Use a rotary pump instead. Get one that puts out the correct pressure for your carbs so you don't need to run a pressure regulator.


And yes, the FI spacers under carb manifolds helps with keeping the carbs cooler, which is always a good thing.
(IMG:style_emoticons/default/smile.gif)

[914Mike]

Any thoughts on leaving the FI pump under the tank when trying out some carbs? I want to just add the facet pump in the stock location, maybe run a switch to the FI pump to use for priming the system.

Plenty of thoughts on both and them thoughts are not positive ...
(IMG:style_emoticons/default/biggrin.gif)

- Don't use the FI pump for carbs! It's a high pressure pump and trying to use it is asking for all sorts of trouble, most notably a burnt out 914!

- Don't use a facet pump! They're noisy and most importantly, they're crap. Use a rotary pump instead. Get one that puts out the correct pressure for your carbs so you don't need to run a pressure regulator.


And yes, the FI spacers under carb manifolds helps with keeping the carbs cooler, which is always a good thing.
(IMG:style_emoticons/default/smile.gif)

So no thoughts on just abandoning the FI pump under the tank while adding a pressure regulated rotary pump to run carbs?

It's just a temporary thing and I'm hoping to not have to take the tank out again (and again to put it back) if I don't have to.

Facet and regulator is what I already have...