What should i replace while the engine is out?

[ChrisA]

Bambikiller,

Can i use an electric fuel pump from a 280? There are plenty of those around, but not so many '73 240's.

Daniel,

Unfortunately i have the N47 head which has round exhaust ports. The MSA sales rep said that i could use the N47 exhaust manifold with the carb setup. is this true?

my plan was to use all the 240 intake/exhaust and fuel/carb system. however, it doesnt seem like it will work out. Will the square port exhaust manifold with the round port head work? any thoughts?

i apologize if these are stupid questions.

thanks,

Ty

The 280Z fuel pump will be too high pressure and I thought it was in the fuel tank on 280's.

You can definitely use the L28's exhaust manifold. You'll just have to go the exhaust shop and have a new down pipe made to hook to your 240's exhaust. You only need to use the L24's intake system.

Here's some bad pics of my aftermarket fuel pump and regulator.

Chris

[Bambikiller240]

Hey Ty, I might not be correct in this but here goes. .................................Hope this make sense. Ask more questions if it doesnt.

Chris

ChrisA: Sounds right to me.

I wasn't aware of the location of the FPR on the L28 cause I've never had one.

[ChrisA]

I wasn't aware of the location of the FPR on the L28 cause I've never had one.

Me too kind of, I ripped that FI system off and chucked it so fast I never really paid much attention. I made my assumption based on my 240SX.

My own experience with this swap was pretty good. The exhaust system was the only trouble. The exit angle of the L28's exhaust manifold is slightly different than that on a L24 and I had purchased an exhaust system from VB for a 280Z. But when I tried to bolt the down pipe to the manifold it hit the lower edge of the firewall where it bends under and goes back towards the rear. I then decided to just take the car to an exhaust shop and let them do it. If I'd had a pipe bender I could have done the whole swap myself. :laugh:

FWIW,

Chris

[beandip]

By all means , if there is any rust on in or around the battery , take care of it now . I also recommend POR- 15 for this. However be sure to use the Mariene clean and Metal ready when preping the metal otherwise the paint may not stick. Important . Also If there ANY leakage at the crankshaft mains especially the rear change it . I wouldent mess with the 240 fuel pump and just go electric , there are wires back by where the fuel line exits the tank. They will be rolled up and taped with blue tape . I used a fuel pump from a RX-7 and it works great and no pressure regulater is needed. Just get one from a NON injected RX mine was from a '79 , $15.00 at the bone yard. If the pan gasket is leaking , this is the time to take care of that as well . DO NOT disterb any crud on the inside of the block ! If you loosen the stuff it can clogg oil passages and you cauld spin another bearing. Check the gasket serface on the pan to see that it is eaven and not distorted from over tightening the pan bolts. I would clean the pan of any sludge before reassenbley, dont overtorque the bolts , It doesn't require much torque for it to seal. You might keep in mind to look into SM needles for the Carbs. Gary

[beandip]

One more thing the RX-7 electric pump is quiet where some of the aftermarket ones are not. Gary :rambo:

[tttz]

I found a mazda wrecking yard that will pull the fuel pump from a 79-81 RX-7 for $35. Not as cheap as $15, but a lot cheaper than the aftermarket ones i saw online. ChrisA, what brand fuel pump and regulator did you get? How much did it cost? Maybe i was looking at top of the line racing ones...

Beandip, what else might i need to complete the RX-7 electric fuel pump swap? you mentioned no need for a regulator. Is that becasue the pump is very good and puts out the perfect constant pressure? or is there some other way to control the flow?

Is there any way to test a used pump to make sure it works before buying it?

does anyone have any advice on the pros and cons of the cheaper used pump versus the more expensive new pump? Some things are not a good idea to get used. is this one of them? (Apparently Beandip has had good luck with it.)

Any suggestions on mounting the electric fuel pump? I guess that can wait till i actually have one in my possession.

Thanks for all the help,

Ty

[beandip]

I pulled the pump form a '79 and took the mount with it. It is just a simple sheet metal thing bent at a 90 deg. and bolted to the floor pan and the pump. You can test the pump by connecting a length of fuel line to the intake side of the pump conect wires to the pump and hook the positive to hot side of a battery and touch the ground to the neg side of a 12vbatt with the hose is some gas. use long wires so there is no spark close to the fuel. You can us keroseen or mineral spirts insted of gas but NOT water. No regulator is needed . You do need to use the 240 fuel rail . The pressure is constant and will not over whelm the carbs , they pump at about 4psi. and enough volume for tripples on a stroker. We tried it . SM needles you will find will produce more performance when you have your foot in it , but wont effect the mileage when driven normally , if you have a light foot. When you can afford it I recommend going to a electronic ignition , I went with a '79ZX dist and coil . '79 &'80s are the same later ones used a different module on the side . one marked 12 80 is what is needed. Hope this helps , congrats and good luck , Gary

[tttz]

Thanks for the help. i picked up the fuel pump from an '82 RX-7 for $35, which i think is kind of a rip off, but i'm too busy right now to find one on my own and pull it myself for cheaper. I asked the mazda wrecker to get the mount with it, and they said they would, but then they just gave me the pump (and some bad service). Just when i was getting frustrated with their lack of customer service i looked up on the wall and saw an aluminum softball bat with "THE MANAGER" written on it. No need to embarrass myself by demanding good service at a wrecking yard!

So, now that i have a fuel pump, any ideas for mounting it?

Also, I was wondering what is meant by "fuel rail" in this sentence, "You do need to use the 240 fuel rail", from Beandip's last post. (sorry, I haven't figured out how to insert quotes.) Perhaps if I get under the car with teh haynes manual, the 'fuel rail' would be apparent.

Again, thanks for all the help.

-Ty

[Bambikiller240]

Also, I was wondering what is meant by "fuel rail" in this sentence, "You do need to use the 240 fuel rail", from Beandip's last post. (sorry, I haven't figured out how to insert quotes.) Perhaps if I get under the car with teh haynes manual, the 'fuel rail' would be apparent.

Again, thanks for all the help.

-Ty

No need to get under the car to find the fuel rail. (see pic)

As for a mount, you'll need to make or find some thing. (Here's a pic of the stock Z car electric fuel pump bracket)

Insert quotes? To start your post with quotes in it.........You have to click the QUOTE button at the bottom right of the post you want quote from

[atomrat]

I purchased a aftermarket electric fuel pump for my 73 240z from Autozone for about $20. This is the one that there computer says works. I haven't had any problems with it at all running round top SUs. They wanted to take about 2-3 weeks to special order the stock mechincal pump.

Garry

[beandip]

The fuel rail is the tubing used to run the fuel accross he engine to the two carbs and return the excess fuel back to the tank. On the 240 motor it starts and ends at the front of the engine . As you can see from Bambi's picture the mount for the pump is only a piece of sheet metal bent at a 90deg. screwed to the body of the car near the outlet of the fuel tank . Use a inline filter between the pump and the tank to protect it from any crud coming form the tank. These are high speed turbin pumps and they dont like to digest rust or dirt. I would also maintain the filter up front by the front of the engine. As I posted earlier look for the two wires wrapped in blue tape under the car by the area where the filler neck attaches to the tank. The factory hid them up there. Gary

[Marty Rogan]

Personally, I would get the Felpro Full Engine gasket kit and change all the gaskets on the engine. It will never be easier than when you have the engine out, especially the front cover gaskets. I also put in a new timing chain while I had mine out. Its a good time to put a fresh coat of paint on the block also. Put on a new water pump also. It's much easier to get at and they don't cost that much.

That's all I can think of in addition to what others have mentioned.

Good luck with it!

Marty