electrical fuel pump

[Bpaccaud]

is the Z are all equiped with electrical fuel pump at the rear near the tank? 260z and 2+2 too?

Because mine avec not the pump and i 'm interesting to know if someone have remove the pump or if it is normal!!!! and my fuel return line was cork, probably when the turbo kit was equipped

The pump looks like the FACET Pump, if i buy one and put it on the car need i a return fuel line?

[Bpaccaud]

someone can answer to my question???

which Z have the electrical fuel pump on the rear near the thank and why? the mechanical pump is not sufficient?

Sorry for my mediocre English......

[tanny]

Apparently Datsun installed the electric pump on the 73's for some type of fuel supply problem. Not sure what. I have a 73 and it has both pumps. On my last long trip having both pumps was fortunate because my mechanical pump malfunctioned and the electric kept me going. Victor.

[Bpaccaud]

thanks for the reply, i plan to had one (a facet pump, which was exactly the same than the original apparently... see picture)

as my engine was modified with a turbo kit (janspeed kit with a single SU hif7 2") i suspect the mechanical fuel pump is not sufficient, but my problem is that the return line was closed when the car was prepare, and i don't know if i can use the the outlet originaly provide for link to the second carburator (on jaguar xj6) as on outlet to the return line.

i already used a filter regulator seeing in the picture

What did you think?

[tanny]

Unfortunately I am not knowledgeable at all about turbo setups, but I know there has to be people on this site who are, so keep asking your questions. I have no idea if you need the return line for that turbo set up or not, but puting the electric pump on is probably a good idea no matter what. Sorry I'm not more helpful on this subject, Victor.

[LanceM]

Adding an electric fuel pump won't hurt, it will keep fuel to the manual pump and reduce the amount of work it has to do to keep the fuel pressure up. You don't need a fuel return line, it was added as a way to reduce emissions, a polution control device.

I don't quite understand your second question, so I'll answer it this way. You can't use the fuel return line for feeding a carbarator, looking at your attached photo it looks like the fuel pump has two outlets, so I assume that one is currently blocked and would guess that it could feed two different lines. A single line should be able to feed multiple carbs with no problem using a Y or other connector to split the line.

[Bpaccaud]

so i try to explain my second question.....

As you could notice in the picture the carburator have 2 outlet which was closed (by black hose) when the carburator was dismantle from a Jaguar xj6 to fit out on the 260z with a single carby sucking by the rotomaster turbo.

One of the outlet is a link to the second carburator (on the xj6) so i ask me, if i could used it for a return line to the tank.

This outlet lead to the top of the float chamber....

i hope i am clear, it 's difficult to me to explain in English

the picture was take when i found the car, she is in best condition now.....

[LanceM]

I understand now. Yes you could use this outlet for a fuel return line but I wouldn't. Doing so would lower the fuel pressure available to the carb, in a high boost situation you might not have enough pressure to feed the carb. I would leave it as it is, you don't need a fuel return line. Cars never had them before the early '70s.

[Bpaccaud]

Thanks Lance, so when i 'll have the money i tryed to put an electric fuel pump, without return line....and i think that my "king" filter regulator would do his job to not "overfuel" the carby

i let you know....

Benoît

[Gav240z]

Hi just covering what lance was saying, the British SU's are a little different to the Hitachi SU's. That blocked off return line is not needed Lance is correct I had a 260z with British Style SU's and these were blocked off on my car also.

To my knowledge the electric fuel pump was fitted 74 onwards, my 73 240z had a mechanical one still.

Funny I always thought that the mechanical one would be more reliable than an electric one, that's why I haven't bothered changing mine and it seems to keep up with the carbs alright.

In a turbo situation I would recommend and electric fuel pump because more air generally requires more fuel and the stock mechanical pump can have trouble keeping up on an N/A Z engine.

They recommend 5 or so PSI but in a turbo situation your best off talking to a tuner especially a carbie turbo setup. :classic:

However a friend of mine was running a blow through carbie setup on his 260z and required a stronger than stock electric fuel pump.

Does that help?

[Bpaccaud]

yes thank you, my 260z is from 1977 and is a 2+2 so it must had one, furthermore on the electric diagram in the 260 z book there is an electrical line to the pump at the rear, but actualy i didn't find it...