240Z fuel pumps - How many different OEMs?

[Arne]

Anyone have any idea how many different suppliers made 240Z mechanical fuel pumps? I ask as I have been preparing to rebuild or possibly replace my original pump, and I'm finding that there appear to have been several OE manufacturers.

These days, the new OE-style pumps seem to be made by 'Kyosan Denki'. But my original says 'Nikki', while a spare top cover I received says 'Ampco'. Any others I've missed?

[Zup]

Hey Arne--
I wondered that also when I removed the cap and saw the lettering as I was packaging it to send it to you.

Some background info. to help with the sorting of this latest Z puzzle:
That Ampco cap (doesn't sound Japanese, does it? ) came from a very original, one owner, 48,700+ mile 1973 240Z that I recently purchased.
Nothing was missing on this car and it had complete documentation of the mileage with service records.
The car came with dual Webers installed, but included in a box were all the dreaded Hitachi flat top carb parts. Every nut, bolt, washer and hose is there.
The previous owners wife was given the car as a gift when she graduated from college in '73.
This car had the "disease" (common in the 73 model) and I was told by the PO that they replaced the flat top carbs with the Webers. The fuel pump was replaced as well. (part of the shotgun approach to the cure) It was in another box and the rest of the pump looks damn near new, so I am 99.9% certain that it is the original.

If you want a Kyosan Denki cap I am sure that I have it on one of my parts cars over at my mechanic's yard.
I don't know about the Nikki--but I'll have a look soon.

Jim D.
"Zup"

[Arne]

No Jim, if I wanted a Denki I'd have simply bought a new pump rather than rebuilding the one I have. Like the '73 you have, the history on my car is pretty complete, and I'm comfortable that the Nikki pump on mine is original also.

So at this point, we believe that:

Edit: I will update these ranges as new data comes in.

Nikki is OE for 10/69 - 5/72
Atsugi for 9/72?
Ampco is OE for ?/73, possibly also a later replacement
Kyosan Denki is a current replacement

Anyone else?

[Zedyone_kenobi]

Hey Arne, I have a 7/71, I can go check mine, here you go.

[Arne]

Thanks, Stephen. That tends to confirm that the Nikki was OE for late '71s.

[rtaylor]

Arne, when I get home I'll check mine for you.

[JonnyRock]

Arne,

I replaced mine last summer with a 'Denki' unit. I just checked my parts bin and the old one was an 'Ampco'.

Now I don't know if that was the original pump or not, but after reading the previous posts I'm inclined to think it's not. In the late 70's my car was converted to dual Webers (how dare they!) before being switched back to SU's in the late 80's.

This leads me to believe my pump may have been replaced as well when the carbs were switched.

[Mike B]

Arne,

All of my cars have the Nikki fuel pump (10/69, 11/69 x 3, and 5/72).

-Mike

[Arne]

Thanks Mike. That appears to broaden the date range for the Nikki considerably. I've edited the earlier post to keep the date ranges current.

[Arne]

Side note - I wonder if the number stamped on my Nikki cover (1701) is a date code of some kind?

[Zs-ondabrain]

Picture #1
My 70' and I think that's the Original, I could be wrong
The red bolts are 1/8" longer than stock because the stock screws kept trying to strip when tightened down.
Picture #2
My 2/74 but the Round top conversion was done so it may be from another Z? Not sure as I don't know the whole history of either car and their P.O's

Dave

[rtaylor]

I checked mine out last night Arne. Nikki 1201. On an unmolested 2/71.

[Arne]

1201? on a 2/71 car? Hmmm. Mine is 1701 on a 7/71 car. That sounds like a bit of a coincidence, doesn't it. Mike B, can you peek at the stamped numbers (if any) on your Nikki covers?

Also, that is one more apparent confirmation that Nikki was the original supplier. Although Dave's K. Denki might indicate otherwise. But so far, all the known-unmolested cars through 5/72 have had Nikkis, and the Ampcos have been on '73s and 260Zs. Mostly consistent so far.

[moonpup]

Coincidence or date code?

Arne ...... 7/71 -Nikki 1701
rtaylor.....2/71 -Nikki 1201

edit-Dang, you're too fast Arne!

[Arne]

Coincidence or date code?

Arne ...... 7/71 -Nikki 1701
rtaylor.....2/71 -Nikki 1201

My thoughts exactly....

[Mike B]

I'll check on my 5/72 tonight when I get home. I did notice the number was different than yours, but don't recall what it was. Also, I noticed that none of my 1969 cars have any numbers at all.

-Mike

[Mike B]

Coincidence or date code?

Arne ...... 7/71 -Nikki 1701
rtaylor.....2/71 -Nikki 1201

The number on my 5/72 is 2501, so the code would actually be:

Arne ...... 7/71 -Nikki 1701
rtaylor.....2/71 -Nikki 1201
Mike B......5/72 -Nikki 2501

There is also an "A2" inside the raised box on the left side. Not sure what that means. The second picture is of the fuel pump on HLS30-00210 (11/69). Notice there is no date code and the screws are different. Same yellow paint blob in the center though.

-Mike

[Carl Beck]

ZDC-2 - Zinc cover
A2=Aluminum cover

For the 260Z's cars with the Zinc covers were recalled - and they were replaced with Aluminum covers. Bad reactions with US fuel additives and Zinc as I recall..

FWIW,
Carl B.

[moonpup]

The number on my 5/72 is 2501, so the code would actually be:

Arne ...... 7/71 -Nikki 1701
rtaylor.....2/71 -Nikki 1201
Mike B......5/72 -Nikki 2501
......snip
-Mike

My attempt at coming up with a date code for these was just a WAG on my part and as fun as it has been, I seriously doubt that Nissan would have been able to put fuel pumps on these cars with date codes that perfectly matched the cars "production date", especially with so many examples of other parts that have dates where the month if not the year is different.

[Mike B]

My attempt at coming up with a date code for these was just a WAG on my part and as fun as it has been, I seriously doubt that Nissan would have been able to put fuel pumps on these cars with date codes that perfectly matched the cars "production date", especially with so many examples of other parts that have dates where the month if not the year is different.

Just trying to point out that the year is the first digit of the date code on these, not the last. No one said that any date codes are ever a "perfect match", but parts should generally be within a certain date range of the cars production date to be correct "as it left the factory". Certainly we have seen examples of part dates that don't match up perfectly with production dates, especially on the earliest cars.

-Mike

[moonpup]

Mike B .... I used your example only because it was the latest continuation of the one I posted and my statement had nothing to do with your contribution per se. I should have maybe used mine.

[Mike B]

Moonpup, I agree with your point. People should understand that date codes are not an exact science, but they are interesting to compare between cars. They help give us a better understanding of the production process.

-Mike

[Arne]

I just got another Nikki cover from Brian at ZCCJDM.com today. Don't know the build date of the donor car (I just asked today), but this one is also stamped 2501. Might not be date codes, maybe some other manufacturing code.

Edit: Brian tells me it came from a '72. Month not known, and the car is history.

[datsunrides]

Can't confirm if it's original or not but my 9/72 with 95k original has an Atsugi pump and has a code of U11F.

Mark

[Arne]

Atsugi? Oh my! A fourth brand! Can you get us a picture?

[240 in OZ]

FWIW, Atsugi also supplied the water pump.

Joseph

[26th-Z]

Cool thread! I'll check my cars.

[26th-Z]

As one might expect, the fuel pump is missing from 27th. I spent the day oiling her yesterday. I figured that if I oil her periodically, she will come apart with a little more ease. I'll tell ya, those rust brothels in Delaware must be brutal. Next time your'e visiting a porn site, imagine what those women are going to look like in 40 years! Eauwww!

26th doesn't have a much better story in terms of fuel pumps. Her Denki fuel pump was spitting oil the last time I drove her. This was well before I came to realize the importance factor of date codes and original original correctness. So, at the time, I just drove over to International Auto Parts and bought this Nikki from Sam and Mahty. It came from Bap-Geon in a Bap-Geon box. The set screw in the center is painted white and notice the difference in the body casting between the two. The Nikki cap is different from other examples also. It is smooth with no raised castings for an A2 stamp. The ink stamp on the base is 1-6-3.

[Arne]

Thanks, Chris. The addition of your info now makes me think that Stephen's Nikki (see post #4) is not original, but is a later replacement. Same smooth cap, no raised bosses, no stamped numbers, and white paint on the center screw rather than the yellow of the originals. Very interesting!

[24 Ounces]

Ok, I realize this post is rather old, but I found my Z's original fuel pump and I thought it might add a bit of info to this thread. My Z was built in 3/72 and has a code on top that reads "1Y01". From what I gather, no one in the club knows exactly how these Nikki codes relate to the date the pump was made. I'm guessing my pump has a late '71 code, but who knows. The pump has a part number of 271070 cast into the side, and also has a small bit of yellow paint still visible in the middle of the screw on the top cover. I got the pump in a box of parts that came with the car when I bought it from the original owner's son. I installed the pump and it will only supply fuel up to about 3,500 rpm, then the engine starves for fuel. The spring that puts pressure on the pump rod is weak...can these original pumps be rebuilt?

[Blue]

1101 Jan 71



even better: the dash has a date of Jan 9, 1971 (a saturday)

[24 Ounces]

Awesome stuff!

[Kerrigan]

Our 1971 FairladyZ-L was supposedly made in May 1971, taking a guess at the spread of production numbers for that year.

The original fuel Nikki fuel pump is stamped "1501"

That would seem to fit the scheme if it is indeed a 5/71 car.

What do you think?

[Kerrigan]

Sorry for the dup post ... too early in the morning!

[Kerrigan]

Confirmed the build date of May 1971 recently with other dates on the car. Just an update.

[Kerrigan]

Ok, I realize this post is rather old, but I found my Z's original fuel pump and I thought it might add a bit of info to this thread. My Z was built in 3/72 and has a code on top that reads "1Y01". From what I gather, no one in the club knows exactly how these Nikki codes relate to the date the pump was made. I'm guessing my pump has a late '71 code, but who knows. The pump has a part number of 271070 cast into the side, and also has a small bit of yellow paint still visible in the middle of the screw on the top cover. I got the pump in a box of parts that came with the car when I bought it from the original owner's son. I installed the pump and it will only supply fuel up to about 3,500 rpm, then the engine starves for fuel. The spring that puts pressure on the pump rod is weak...can these original pumps be rebuilt?

Yes. I just cobbled enough parts to rebuild my original, except for the spring. I've that on order from NISSAN PARTS. We'll see if they can get it. The aftermarket pump on it now is putting out too much pressure so I'm adding an inline regulator to hold it down to 3.5 psi until I can get my original rebuild accomplished.

[Stanley]

A few (two?) years ago I saw a rebuild kit for 240Z F.P. online; went back later and couldn't find it. Hope you find the parts.

Looks like this thread was to find replacements for the OE Fuel pump but Denki is no longer made in Japan and the new ones are stamped metal which don't look right and are useless to me since I run a fuel pressure gauge from an AN hose tee'd from the outlet, impossible with stamped metal. My OE style Denki from Pep boys is fairly new but I want to rebuild my old Nikki that was on my '73 when I got it, for a spare.

Also, been trying to get a OE style Carter (made in USA), but the new ones are stamped. I called the Carter factory many times, left messages and emailed them, trying to find the earlier type, but never received a reply. I called Rock Auto and they said they had the OE type Carter, and directed me to the photo of it on their site. Two days later the photo was removed (respect them for that).

BTW my Denki is putting out 4.0 psi, and my float valves don't have a problem with it.

[zKars]

Kerrigan, I have a bunch of old fuel pumps. I can scavenge any parts you need. Not sure how many Nikki or other. Let me know and I'll look. Just took a stock 10/70 engine apart that had one.

[Kerrigan]

BTW my Denki is putting out 4.0 psi, and my float valves don't have a problem with it.[/QUOTE]

I put on an aftermarket Carter and it's putting out 6+ psi causing the carbs to load up, dump gas, and stall when idling. Putting a regulator in the line to limit it to 3.5 psi while I try to get my original 1501 pump rebuilt, or find a good condition Nikki replacement.

[Stanley]

What model is your Carter, mechanical or electrical?

[Kerrigan]

What model is your Carter, mechanical or electrical?

Mechanical. Supposed to be for the 1971 FairladyZ. Carter M60107 on the box label. The sheet included shows diagrams of the original Nikki pump, version 1 and version 2, and says 1080 fuel pump assembly. It gauged putting out 6psi instead of the maximum 3.5psi the carbs will handle without flooding out at idle.