Fuel hose size and other fuel Qs

[pope]

I had leakage from hoses near the fuel pump and so I had to replace some of them. To be on the safe side, I want to replace all the hoses because they look pretty old. I guess I have to change the fuel filter too. So I have some Q's:
- is this filter OK for use with this specific setup (2.2E with webers)? If so, should I change this also?
- which size of hose should I use for the hoses in the engine compartment. They all look the same size to me.
- there is a clamp a few inches to the left of the fuel gauge. What is that doing there? It's clamping the hose that sends fuel to the carbs. Is it like a regulator?
- should I also change the two little hoses on the carbs or are those included in the weber rebuilt kit?
- here are a couple of pix of my fuel pump. They're off a cell camera so they're not that good but maybe someone can tell me which pump this is and if this info helps answer some of the questions here:

[pope]

bump

[pope]

Anyone? At least the fuel hose size question. I need to change those very soon.

[pope]

Will this filter work OK with the webers?

[RoninLB]

I don't know what kind of filter that is?

In the US a routine auto store fuel filter is rated around 10 microns. 911 carbs have a tendency to be dirty fuel sensitive. I used a marine gasoline fuel filter with 2 micron replacable element. Other options are 5, 10 microns.

A local pope uses the Racor gas fuel filter that has replacable element and able to withstand 100psi. Costs around $75US and elements may cost around $15-25US.

My Racor is a different model with spin on external element, which I do not recommend for others.


Does that unit come apart to replace an internal filter ?

[Danny_Ocean]

Originally Posted by pope

- here are a couple of pix of my fuel pump. They're off a cell camera so they're not that good but maybe someone can tell me which pump this is and if this info helps answer some of the questions here:

What are the numbers on the bottom of the pump? That will tell exactly what you have.

[BlueSideUp]

It looks like the part with the gauge is a fuel pressure regulator to control your fuel pressure. The MFI fuel pump puts out higher pressure than the carburetors can handle. If I remember correctly carbs need about 5 to 8 psi and I'm not sure what pressure MFI runs at.

Most of my fuel lines are 7.5mm x 13mm Cohline.

13-31-1-469-781-M20

Fuel Hose, (7.5 mm ID, 13.5 mm OD) High Pressure, (quantity as needed, priced per meter)
Brand: Cohline

$5.50

I think I ordered 2 or 3 meters for my car. I also have 8mm fuel line but I think that is the fuel line from the tunnel to the driver's side metal pipe. I haven't done the fuel pump lines yet.

Since you have a fuel return line you can do a Weber recirculating fuel modification pretty easily, do a search and you'll find some great threads.

[Danny_Ocean]

MFI puts out 14.2 psi. (1 bar with 2 bar relief). We can't be sure that's an MFI pump, however, without seeing the #'s. Kinda looks like a 0001 at the end though, huh? I have a rebuildable pump for carbs if the pope needs one...I'll gladly take that old greasy thing off his hands if necessary.

Originally Posted by BlueSideUp

It looks like the part with the gauge is a fuel pressure regulator to control your fuel pressure. The MFI fuel pump puts out higher pressure than the carburetors can handle. If I remember correctly carbs need about 5 to 8 psi and I'm not sure what pressure MFI runs at.

[pope]

Part # 0 450 135 002

This looks similar to a fuel filter for an MFI (which my car used to be before it was converted to webers).




The pressure gauge goes up to 3 PSI when the pump is on and a bit higher when the engine is running (but it's been a long time since I checked that).

[RoninLB]

these are PMO regulators with a return line as far as I know.

[Danny_Ocean]

What is the part # stamped on the bottom of the fuel pump?

[pope]

Danny, I gotta squeeze under the car to get that. I'm going to do it tomorrow probably and I'll tell you. I believe it must be an MFI pump though.

For the time being, I'm reading a lot of threads on fuel delivery and I'll post links to the relevant ones in here as soon as I compile it.

[Danny_Ocean]

Not important, as long as you have a pressure regulator installed, which it appears you do.

P.S. - My barber is from Romania and she is HOT! Tell me something I can say to her in your language to make her get undressed...

[pope]

Haha. I'm not Romanian actually and my Romanian is a bit vulgar, don't know if you'd get the best result from my suggestion.

[pope]

So, I've read loads of threads all day today. Most enlightening I found to be the following:

+ Brilliant thread that focuses on MFI (thread subject is misleading): Braided Fuel Hose for a 72T MFI

+ Webers and fuel pressure regulators, yes or no?

+ AKA Tyson's recirculating system: 2.7RS fuel delivery system

+ And its application: Carb Plumb Loop pic

+ Weber fuel recirculation- Questions


Now, my setup looks a lot, if not exactly, like this one. Down even to the MFI filter and how it looks like it's connected.

And here's a diagram and a couple of pix to make it clearer:


I think it's clear from what I've read that I will need a fuel pressure regulator. But I'm not sure which one I should get (brand and model) and where exactly I should install it ( I assume on the return line right after the gauge).

I'm not sure what the Tyson method would look like because there was no diagram anywhere and it wasn't 100% clear to me from the text. Is it worth me going to that one or should I stick to what I have?

Finally, should I keep the MFI filter as it is connected or should I replace it with this:

[RWebb]

PMO make a good one - about $40 -- about $80 if you wnat the higher bling-factor billet one

incl. a gauge

not sure re MFI - it is very high pressure

Good job collecting the threads - that will help others long after you are motoring along

the Racor is the std. high zoot fuel filter - I hope to add one before EtOH is required here...

[pope]

It seems that PMO does not sell them on their own and I found reference on their site to the Holley regulators. I found this page which has two versions that seem to fit my requirements - the 500 and the 804.

The question is, how do I hook this up to my plumbing?

[pope]

Originally Posted by Danny_Ocean

What is the part # stamped on the bottom of the fuel pump?

0 580 970 001

[Danny_Ocean]

Originally Posted by pope

0 580 970 001

That is the correct pump for MFI.

[pope]

Can anybody help with my pressure regulator issue please?