Help installing SC fuel pump into a 74

[JP911]

I'm getting my "new" 74 coupe ready for my 3.5 and I have a new SC fuel pump to match up with the 78-79 CIS on the 3.5. On the 74 the pump is in the engine compartment/wheel well and the fuel line fittings are different than the cars where the pump is mounted to the front crossmember. Any tips or directions on how to install the SC fuel pump in this car? Thanks in advance.
-Jon

[juanbenae]

jon will you be mounting the new one up front under the pan like the SC version, or are you going to try to keep it in the driver rear quarter area? prolly not much room with all that 993 exhaust wizardary and twin plug heads and wires at the rear...

i would think you are going frontside? if so there are two fuel lines that run through the tunnel that are porsche parts, and be boo-koo bucks. michigan mat pulled new fuel lines through his tunnel in my driveway and had a hell of a time getting them through. that was even using the old line to pull the new ones. he used regular hose, and recycled his fittings. his was a 74 with an SC motor and his pump residing in the rear quarter. i guess what i am getting at by mentioning that last part is that his did not need the high, post pump CIS pressures through the tunnel..

so is it up front, or out back?

[JP911]

Mine is out back and I would like to keep it there. It is pretty much out of the way and the 993 exchangers will not interfere. The idea of running new fuel lines makes me want to run screaming from the building. If I have to go to that extreme, then I am paying a professional to do it for me. I can't take any more hellish projects.

[cowtown]

I went through this with my early-'75 chassis (with rear pump) when I put in a 930 engine. The 930 engine uses both front and rear pumps.

I got the front Porsche mounting bracket from a wrecking yard for around $20. That's the easy part. For fuel lines, I pulled out all the old CIS plastic stuff and put in Aeroquip 6an stainless sheath lines. I don't know if this is a direction you're considering, but I can help with part numbers if it is.

[JP911]

How hard was it to install the stainless lines?

[JP911]

Bump for input from the AM and East Coast crowds.

[randywebb]

IIRC, both Grady & Steve Weiner have said to relocate rear fuel pumps to the front to prevent heat problems. Even for Oregon... so since you are in Cali. ...

There is a thread with some info about how to do this...

[juanbenae]

don't know if this is the one randy means, but good info none the less..

3.2 Carrera engine swap: fuel system changes

[john walker's workshop]

you could leave the 74 pump. same pressure.

[JP911]

Thanks John. That is really good news! Just to be clear, you're saying that the 74 pump will work with 78-79 CIS on a 3.5 liter motor? Are there any advantages to using the later pump?

[Staylo]

Jon,
I just picked up a pump this afternoon at EASY from a 79 SC. I bet they still have the mounting bracket if you needed one.
Just a thought.

[john walker's workshop]

i don't see why the 74 pump wouldn't work. CIS systems all run the same pressures, except turbo. the 3.5 wants more gas than the old 2.7, but the pump should be able to keep up with it. that way you won't have to modify the fuel lines, at the pump anyway. the real nice way would be to update to ALL the later lines thru the tunnel and everything, then all the fittings in the engine compartment would attach properly without any hose clamps.

[JP911]

Thanks again for the info John. I see your point about the 74 fuel lines with the hose clamps; they don't inspire much confidence. I think I'll make the fuel line refit a project for another day as I'm dying to get this 3.5 running (it also sounds like a bear of a task).

[BoxsterGT]

cowtown -

I know this is an old thread, but I am curious as to how the AN-06 fuel hose has held up. One issue is when you use SS braided hose you cannot examine the rubber part for age and condition.

In 10 years time there must be something to report, good or bad.

Of course, over this time lots of improvements have been made with hose and rubber compounds, mostly as a result of the Ethanol fuels.

Len

[BoxsterGT]

cowtown-

Are you still around the Pelican board?

Anyone else have long term results with AN braided hose?

Len

[mhackney]

Len, simply look at cowtown's profile and it shows the date and time he last logged in - 6/9/2016. So it seems he is still around.

[chrismorse]

When I brought Dad's 74 to its new home, (500 mile trip), it had a gas leak. The fuel return line was routed right under the heat exchanger hot air dump and the line looked both soggy and seriously deteriorated.

Give all of those old lines a good look. Gas leaks are no fun.

chris