i just finished an engine swap (l28) in my 1972 240z that has been sitting for like 3 years. everything was ready to go except the fuel pump isn't working. Its an electronic fuel pump located just in front of the gas tank. i checked the voltage of the wires to the pump and was getting 11.5 volts, so i figured i have a bad pump. i went to schucks to purchase another one, but all they could find me was a mechanical fuel pump, which i was not even aware was on the z. i looked for a spot that it could go, but couldn't find one. the car ran with the electric fuel pump just fine when it worked, so i would like to replace that part, not swap a mechanical one in there. Am i wrong? are there two fuel pumps in the Z? and could anyone help me find the part that im looking for? the part number is 4070j21a on the electronic pump.

the pump on the right is what they gave me, the pump on the left is what im trying to find.

You didn't say if you're running carbs or EFI with your L28.

If you're running fuel injection, you need a high-pressure fuel injection pump. One for or from a 1975 and up Z car would work, 1975 - 1978 would probably fit your car best.

If you're running carbs you need a low pressure pump, or, depending on what year L28 you have, you might be able to install the mechanical pump. Maybe, I don't know for sure. Look at your old engine, you'll see the mechanical pump on the front of it.

The pump on the left is a proper mechanical pump for carb models, that bolts to the front of the motor on the right side if your cylinder head and cam allow it. That will give your carbs the correct pressure. The electric pump can be used as a booster pump and mounts in the rear in front of the fuel tank. You do not need more than 3 or 4 lbs of pressure, more than that is to much for the system. This is only a booster pump. If you use it as your main pump then again, no more that 2 to 4 lbs of pressure or you will overwhelm the carbs. I'm running triples and have a low pressure booster in the rear and mechanical up front and I am not having any problems with it. The 73 models had this setup to help with vapor lock problems. You are running carbs aren't you ?

Edited July 6, 201113 yr by 240ZGL

Do you get any "buzz" sound at the electric pump when power is applied - or just silence? Have you tried tapping the electric pump with a hammer in case it's just a little stuck from sitting three years?

Dennis

That electric pump is a Carter, Jegs has them part # 180-P4070

Assuming it's a carb'd engine I'd run a 80-81 RX-7 electric pump. It puts out a steady 4psi and is very quiet. That's what I've been running for years now in my 71 240Z.

I second the use of an RX7 pump. I'm using it with a mechanical booster pump on my 1973 3.0 liter Rebello stroker with SU's and by itself on my 1971 which has triple Mikuni's. Very quiet pump. The only time I hear it is when the engine is off.

Resurecting an old thread. I like the idea of using an RX7 pump on my carb'd 240z. I have stock twin SU's and my car currently has a small canister pump like the one listed below. I am doing a full fuel system rebuild and restoration and the pump is annoyingly loud.

http://www.ebay.com/itm/BMW-Chevy-Dodge-Ford-Saab-Toyota-Pickup-Truck-External-Electric-Gas-Fuel-Pump-/230795876920?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A1981%7CModel%3ARX-7&hash=item35bc819a38&vxp=mtr

I would like to replace my canister pump with an RX7 pump. Is the pump below correct for a '81 RX7 and to be used in my application? It looks a lot like an in-tank fuel pump but is designed to be run externally. Even looking on the parts store websites do not call out which one is correct for a carb'd vehicle as it lists both exact kits.

http://www.ebay.com/itm/CARTER-P60504-Electric-Fuel-Pump-/170830783182?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A1981%7CModel%3ARX-7&hash=item27c64ee2ce&vxp=mtr

That should work. You'll need a fuel pressure regulator to cut the psi back to 2-2.5. I'm stilling running the stock salvage yard pump.