Datsun Roadster Parts from Rallye Enterprises, Ltd.





If you have the nonrebuildable style pump; or don't have a pump at all; you also have the option of buying a rebuildable pump core and one of these kits; or a new pump assy. If wanting to go the core and kit route; order the applicable fuel pump number with "CORE" after it like 170-04-CORE etc. The price for the rebuildable core and kit is currently $80. A core is just a pump yanked off an engine. It may be the old style with the thin flanges or the 1980 onward style with the thicker flanges. You may need to install the fittings off of your old pump. No attempt at cleaning is done as if we go that far we might as well just finish the job and rebuild it. That will come someday I am guessing


Some pumps can be easily rebuilt, others cannot. The design of the newer pumps makes it next to impossible to get the old diaphram out. The only way you will know for sure that yours CAN be easily rebuilt is to take the upper pump body off of the lower pump body. If your pump is still good and you are doing this in advance of the pump failing you can do this without removing the pump if you wish.

First you want to clean the pump so you don't get any dirt inside it. Then you remove the large ring of 6 screws around the lower pump body. (Not the 4 screws that hold the cap on). If you have a metal fuel line attached to the pump you will have to remove it. Be sure to keep a metal container handy as the line will drain. Do this outside, never with a cigarette nearby and never with a electric "drop cord."

To separate the pump halves you may need to carefully wedge a putty knife or kitchen knife around the circumference to break the seal. (Are you sure you removed all 6 screws?) Once it pops up you can move it out of the way. You will be looking at a big rubber disc with a shiny plate in the middle. In the upper left of the above picture you will see this disc (the diaphram) in this picture it is upside down. See the peg coming out of it with the"T" on the end?

To remove your old diaphram you have to push the metal disc down and turn the disc 90 degrees so this T will be parallel to the slot that it is in, in the bottom of the pump. I usually use the palm of my hand or both of my thumbs to press down and turn. With just a little amount of jiggling and experimentation you should have the diaphram pop up. To reinstall it you simply line up the T with the slot you see down below, put it in and push down and turn 90 degrees and it will be "latched" again.

If no amount of pushing and turning 90 degrees every which way will allow the diaphram to pop up you have a later style pump which as of yet we haven't found a way to dismantle easily. It can be done, but requires some talent to press out the lower pin. With these you'll find all kinds of positions, none of which will allow the diaphram to pop up and be removed. One position will tend to keep it pulled down in the body, you don't want this if you are reassembling your pump for use, you'll need to push down and turn it back so that it has that spring up and spring down feeling when you push on it. But look on the bright side, at least you didn't order a kit only to find it would not help you...

Even if you have the older style pump and decide to get a new pump, I would suggest saving your old one, as there may come a day when new pumps are not available and an old-style rebuildable one will be nice to have.

Do you have some old pumps and are trying to figure out quickly which are easily rebuildable? Check the arm that goes inside the engine block, does it have a pronouced rounded-off look? I haven't seen one of those that isn't rebuildable. The newer style pumps have an arm that has one bend and then is straight, is also longer then the old style. Most of those I've seen have the pesky diaphram attaching method, but not all of them.


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