77 911s Fuel Pump Check Valve

[Moozak]

Looking to order a Fuel Pump Check Valve for a 77 911s. I see listings for 80-83 and 84-89, but for 77-79 it is described as a "Connection (M12 X 1.5 - M10 X 1.25)".
part # is: 911-608-211-00-OEM

Is that the right part to order?

Thanks,

Jon

[blucille]

Nope, that's just a fitting, some have adapted the later check valve, but you'll have to find the banjo fitting and cap, and do some minor modifications. On your car, the check valve is likely built into the pump.

[Moozak]

Wow, fast reply! Thanks for the tip. I'll check into it,

Jon

[kach22i]

When I had problems I replaced the whole fuel pump.

An old car, so why not and it's an easy job.

No start last night - starts up this morning

Originally Posted by ossiblue

My understanding is the check valve is either attatched to the fuel pump, or is integral to it. I think most replacement pumps have the valve internally. Not sure of where it is on a 77 but someone will know.

[Uncle Enzo]

Originally Posted by kach22i

When I had problems I replaced the whole fuel pump.

An old car, so why not and it's an easy job.

No start last night - starts up this morning

What pump did you go with? Mine sounds pretty rough and needs to get replaced.

[kach22i]

Originally Posted by Uncle Enzo

What pump did you go with? Mine sounds pretty rough and needs to get replaced.

I checked my old e-mails from Pelican (twice) and the confirmation is not in there, but the $202 price seems very familiar.

911-608-102-00-M14 is what shows up in the parts catalog, looks to be "out of stock" if I'm reading it right. It's a Bosch part which I most likely picked up locally (S&G Import Parts) because I was using the car almost everyday back in 2008.

I do not think the replaced part had an external check valve, so maybe it wasn't original. The two pumps matched each other, that much I do recall.

[Uncle Enzo]

Great. Thanks for the info.

[Moozak]

What would be involved in fitting a pump with an external check valve to a 77?
Are the fittings available at Pelican?

[Flat6pac]

The 77 to79 used an internal check valve, the same pump.
The 80 on used the external check valve and the factory changed the banjo fitting on the chassis fuel line so nothing is easier to match up.
Bruce

[kach22i]

Originally Posted by Flat6pac

The 77 to79 used an internal check valve, the same pump.
The 80 on used the external check valve and the factory changed the banjo fitting on the chassis fuel line so nothing is easier to match up.
Bruce

Thank you for the clarification, 1977 is an unusual year in so many ways being a transitional year. It's sometimes hard to recall all of the quirky similarities or differences between different years.

Make sure you tuck up the new fuel pump as high as it will go.

The protective plate or pan has to fit back over it when you are done.

[john walker's workshop]

using the later larger check valve requires the banjo to be enlarged. i use a tapered reamer in a drill motor. hold the banjo with curved jaw visegrips, firmly, but not so tight that it distorts, and go slow. ream just enough (both sides) to get it over the fitting and dress the now fairly narrow sealing surfaces with a fine file. clean well and tighten firmly with new sealing rings. check for leaks before installing the cover plate. needs the larger cap nut too.

[kach22i]

Thanks John.

Mine was a one for one swap, no messing around with the fittings.

And as far as leaks, yes do a leak check first.

My experience with replacing the fuel pump was much more smooth and predictable than changing either the fuel accumulator and fuel filter.

I guess that I like being on my back under the car more than I like being bent over and straining my lower back.

[LM3929]

Moozak

I have several extra check valves, extra fittings and caps if you want to come over and try them I live about 15 minutes away in Lovely south Surrey

Lorne m.

[Moozak]

OK, Lorne, thanks for the offer. I've sent you a PM with my contact info. I work in South Surrey, so I'm in the area quite a bit,

Jon

[BoxsterGT]

Here is what the later front mounted fuel pumps look like....






The check valve is the brass proboscis with the holes thru it. The early models 76-77 used a ck valve with a 10mm body & matching Banjo & Nut. All later versions have a 12mm body & banjo & nut.

Check all the hoses & fittings carefully, as they are likely original and now 37 yrs old plus. When there is a problem with the feed hose into the Tunnel, the only new factory replacement comes with a 12mm Banjo.

Be sure to use new Copper crush rings at the banjo when doing the swap.

I can make up a front repair hose with a 10mm banjo if needed.

Len

[Moozak]

Thanks, great photos... Nice to see some detail. Does the newer style pump fit physically in the space on a 77, or would there need to be any further modifications? My thinking is that if I needed a new pump, I would like to go with the newer style to utilize the external check valve and modify the fuel line for the larger banjo... Has anyone done this?

Jon

[boyt911sc]

Originally Posted by Moozak

Thanks, great photos... Nice to see some detail. Does the newer style pump fit physically in the space on a 77, or would there need to be any further modifications? My thinking is that if I needed a new pump, I would like to go with the newer style to utilize the external check valve and modify the fuel line for the larger banjo... Has anyone done this?

Jon

Jon,

Go back and read Bruce A. (flatsix) and JW's posts. The new external check valves is larger in diameter and would need a bigger banjo fitting. This would be the way to go unless you could find a smaller diameter external check valve used in 944's which I did on my '78 SC and kept the old original smaller banjo.

For me, it was the simplest conversion using the new FP with external check valve with right OD as my existing banjo. The problem is finding this external check valve. For my bench CIS set-up, I had the bigger banjo fitting conversion installed.

In summary, the new FP check valve is 12 mm (inlet)/12 mm (outlet for the banjo). If you could find a 12 mm (inlet)/10 mm (outlet) check valve is a good option. You have to decide which way to go and depending on availability of components. Keep us posted.

Tony

[BoxsterGT]

Here is my Front Hose Repair (E85 rated) for temporary use until your Tunnel Lines are replaced w new........



Temporary in that you must use hose clamps to install.

Two Copper crush rings are included. For details, please email me only.

Len at Autosportengineering dot com