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Datsun 1200 GX fuel pump question
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I have a Datsun 1200 GX 1974 model, twin SU carbs (Hitachi). The fuel pump is original I believe (see picture), and I want to replace it with a new one (as a precaution). I found a new pump on EBay for a Datsun 1200/B110, picture shown. Will this work on a GX? Or does the GX use a different pump because of the twin carbs?

Any insights will be very helpful.

Attach file:



jpg  datsun_1200_GX_engine.jpg (154.42 KB)
15380_615d318b7e180.jpg 1288X1550 px

jpg  datsun_1200_b110_pump.jpg (83.71 KB)
15380_615d319b5dc38.jpg 794X636 px

jpg  pump_box.jpg (156.39 KB)
15380_615d31aaa8af3.jpg 1098X1232 px

Posted on: 10/6 6:19
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Re: Datsun 1200 GX fuel pump question
No life (a.k.a. DattoMaster)
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Best bet is to remove the old one to compare to the new one when going to the shop to buy. The GX uses the same pump that the normal A12 engines used. No differences due to the twin carbs. Your issue is the arm that is on the pump that comes in different lengths. Here in South Africa we also found the aftermarket pumps at the auto stores are not of the same quality as the originals. It would be better to go electric pump.

Posted on: 10/6 10:43
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1977 Datsun 1200GX
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Re: Datsun 1200 GX fuel pump question
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yes there are two different length arms which means the two types of Fuel Pump are not interchangeable

* Early A12 - short arm
* Late A12 - long arm

Pumps with the short arm only fit front-distributor engines (before-1974)

Pumps with the long arm fit 1974 and newer A12 (and all A14/A15)

It's difficult to tell by looking as the arms only a bit different

Posted on: 10/6 11:38
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Re: Datsun 1200 GX fuel pump question
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Thanx for the info. My distributer sits up front, and the alternator sits below the 2 SU carbs. The car was imported from South Africa to Australia. I think this was the pre 74 arrangement.

Yes I thought about installing an electric pump. Only thing that bothers me is that the electric pump has to be mounted close to the fuel tank, and I see no nice space there for the pump. Any ideas where to put the electric pump back there near the tank?

I found an electrical transfer pump with the right pressure on EBay. So that is not an issue, its more the installation that is an issue.

Posted on: 10/6 11:48
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Re: Datsun 1200 GX fuel pump question
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Electric Fuel Pump need not be by the tank. I ran different electric pumps in my Datsuns and all were in the engine compartment. I believe people say that for fuel injected cars, but a carburetor needs a low-pressure pump (2.6 psi stock, 3.0 psi A14, even Weber says not to go over 3.0 psi)

first used the square Facet/Beck-Arnley style mounted on the firewall, worked great with my stock A12
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my last 1200 with twin-carb A14 used the Nissan electric pump, mounted below the battery
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The electric works OK, but are kinda noisty

On the other hand my 40-year old mechanical pump was still working on my A12 sedan. The only problem it ever had was getting the internal mesh filters clogged from bad fuel resulting in low pressure. Removed the top, washed it out and it was good to go for more years

Posted on: 10/6 12:37
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Re: Datsun 1200 GX fuel pump question
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Now I am tempted to install the electric pump. I can place it under the battery indeed.

My 45 year old mechanical pump is still working fine. What worries me is that one day on the open road it starts leaking fuel into the sump. I met a Datsun owner who told me this happened to him, and his 1200 engine failed. So its a precautionary step to replace the mechanical pump. Whenever I drive her now, I fear this outcome.

Posted on: 10/7 1:04
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Re: Datsun 1200 GX fuel pump question
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The main reason why fuel electric fuel pumps are mounted in the rear is to pressurize the fuel lines, by doing so it lessens the possibility that fuel will boil in the fuel lines and cause vapor lock when exposed to a lot of heat.

Posted on: 10/13 19:08
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