Do aussie 260Z coupes have an elec fuel pump?

[Murph]

As in title.

I thought the 260Z's were all supposed to have an electric pump as well as the mechanical pump? Mine sure as hell aint got one.

I've been having a few vapour lock problems now that I have the car back....or what I am assuming is vapour lock anyway. Almost 40 deg days aren't helping. Basically, whenever I get hard on the power it'll be fine through 1st, then either up in the revs in second or into 3rd, it'll just loose all power. Back off and it's fine.

The problem is alot worse when the car heat soaks after a drive.

Yesterday I gave it a boot leaving the servo upto about 80, then looses power.....and it kept on doing it for a few minutes to the point that I could only just hold 60kmh. Just putted it around for 10min then it was ok.

Ideas?

[Mr Camouflage]

My Aussie 260z 2+2 has an eletric pump, and no mechanical pump.

I dont know what year it is though. I'd guess and say 76 because thats what the compliance plate says, but the chassis numbers is different to whats stampd on the car, and the datsun id tag, well thats different again!

[Murph]

Mine being march 74 is one of the very first 260z's....which seem to get quite mixed bag of bits and pieces.

[Zpeed]

that sounds like a fuel pump problem....

meaning like i had the same problem.... the fuel pump was only pushig 0.8 psi, when it should be pushing 6-8psi, so its fine for normal driving, but not enough to keep the floats full when going hard... check your fuel pump presssure with a normal pressure guage...

i would cain though 1st and 2nd and hit 3rd and id have to back off and put it in 5th... it would start stuttering

my 260 had a electric pump, i changed it to a facet pump, sometimes the pumps go bad when sitting for a long time, i think urs was sitting for a while yer.

[Rusty1]

Mine is 7/74, it has a mechanical pump.

I had problems similar to yours but it happened regardless of the weather, check your coil and leads, it fixed mine. (my coil was old as the hills) although I have heard that S.U.'s are prone to vapour lock, it hasn't been hot enough here yet for me to find out.

Good luck.

[260Zed]

I've got a 75 and mine only came with the mechanical pump. Ive had probs with vapourlock, but since changed to an rx7 fuel pump, it helped fix the problem, but not completely. So I'm getting the extractors ceramic coated and probably make up a heat shield too. Ill tell ya my results.

[Zpeed]

i think 76+ came with electronic pumps...

[Gav240z]

my 75 260z 2+2 had an electric fuel pump however it was nowhere near stock so...

[Brett240]

if your getting up too 40 degree days then im suprised your vapour lock isnt worse. the more prssure you run through the lines the less problems you'll have with vapour lock.

though never use an EFI pump with carbies, thats too much pressure.

change to an electic pump, as 260zed stated try an RX7 pump off a carbureted car or by a new carter carby pump. also heat shielding your fuel lines that run through the engine bay to your carbs can help.

[HKSZ]

I'd be looking at the $2 parts first.

Your problem sounds like a clogging fuel filter

Steve:geek:

[Murph]

It seems what I have is two problems. One is where it just seems to run out of fuel when you get up into third, exactly as Zpeed described. Also the vapour lock problem.

This morning I got stuck in it for 30min after stopping at 3 places for about 5min each, with only 5min driving between them. It stuttered then just died.

It seems an electric pump is the go. Just tossing up whether to go something good like the carter, a cheaper new pump or something like the RX7 pump from the wreckers.

Fuel filter should be only 3000km old.....but I'll check it out anyway.

One question... If I bought the carter, i'd just wizz off the mech pump totally right. But if I got say a cheaper elec pump, would you run it in series with the mech pump?

[Gav240z]

You can run both in series but I've kept the mechanical one on my 240z and never had any vapour lock issues. Mind you my bonnet has always been fluted.

But my previous 260z was not fluted and had electric fuel pump never had fuel starvation. If you getting same problem as Zpeed sounds like fuel pump ain't putting out enough PSI.

Get it tested if your unsure.

You can even buy a fuel pressure guage.

[Brett240]

you gotta remember Gav,

Datto-zed lives in townsville, its bloody hot up there,

the heat soak that would be produced from a couple of minutes sitting in the sun would be intense. the mechanical L series Pump doesnt hold up well in really hot weather. your right though it probably isnt putting out enough PSI but i doubt even a new mechanical pump would be able to keep enough pressure to stop the problem especially with summer ciming up.

another advantage of an electric pump is that you can turn it on before the car is stared, this will pump fuel through the lines and help purge them of vapour before the engine is started.

datto-zed,

if you go with an electric pump see if you can get the original electric pump bracket that is located in front of the fuel tank, this will make life easier with mounting. its up to you what pump you use, just make sure its a carby pump. you should be able to get one pretty cheap at a wrecker, i think a carter pump is a couple of hundred bucks.

[Murph]

Brett240's right....it's be just under 40deg up here all this week.

I think I'll give one of the RX7 pumps from the wreckers a go. I see if I can get one of these brackets too.

I still have to replace all the fuel tank vent lines, so I'll do whole lot in one hit in the next few days.

Thanks for all the help guys.

[Brett240]

oh by the way if you go with the electric pump throw the mechanical one in the bin. it will end up being more of a hindrance than a helper. with the electric pump being able to flow better the mechanical pump will turn into a restriction in the line...

[Murph]

So would I just not use the mech pump, or would I completely remove the pump from the engine? If so are there any hastles in doing so, or is it straight forward?

[Brett240]

unbolt it, take it off and put a plate over it to cover the hole. then hook some new fuel hose up to your metal fuel lines.

completely straight forward.

you can leave it in there and just bypass it, but all it will do sitting there is add drag on your camshaft (the pump operates off a lobe on the front of the cam).

[Murph]

Sweet.....easy done.

[Gav240z]

Just as a side note don't throw it out, 1 thing I've learnt never throw anything away just incase.

It could turn out not to be the cause but from what Brett is saying 40 degree days could also not help.

Although I've had my Z run fine on hot 40 degree days in summer I remember coming back from Rosebud down here and it was something like 45 degree's and going along the highway the wind was so hot with the windows down and all.

[Z Kid]

If you want to do it all properly, you should be able to get a blanking plate off an L26 engine, and if you cant find one, I am sure I could dig one up from a scrap motor lying round here.

Cheers Chris

[Murph]

Thanks for the offer z kid. I'll see if I can pick one up at the wreckers tomorrow, but if I can't....i'll give you a yell.

[HKSZ]

To the best of my experience VL only occurs after turning off, when the fuel stops flowing. An old 260 of mine had an elec pump and it still was a bugger to start on 35+ days.

I guess your using the original flat top carbs? If so block off the water lines that run to the base of each carby, they're designed to warm up the carbs. ie for european markets.

Still reckon you should replace that filter!

Steve

[260Zed]

At the moment Ive got the mechanical pump still in the line, but looking to get rid of it cleanly, the blanking plate as mentioned, can I get that off a fuel injected L-series engine?

(BTW I got the rx7 pump and bracket for a steal, $45 and it looked new, couldnt believe my luck! Was difficult to find tho...)

Cheers

[Z Kid]

Not sure what else it would come off, I know its on the later 260's (well the block in the front yard anyhow), and hence I would assume the ZX's and skylines have it as well?

[Murph]

Just spent all day going around all the wreckers here....no one has an RX7 fuel pump, let alone anything rx7!

Ended up buying a carter.....I'll need it down the track anyway. Ran out of time to installing it today, and I'm having trouble undoing the bolts that hold the fuel tank straps (replacing the vent lines while I'm at it).

HKSZ: I'm using the 240Z round tops. Stock heat shield is in place, but as soo as the headers go on i'll be making a better heat shild.

Oh... and I'll be buying a new filter tomorrow.

The local z guru told me that some 260's had the electric pump, some didn't.