retrofitting electric fuel pumps...

[Marty Rogan]

Here's the pump I plan to use when I swap in my L28.

http://store.summitracing.com/partdetail.asp?autofilter=1&part=HLY%2D12%2D801%2D1&N=400178+115&autoview=sku

The first one you posted actually resembles the stock elec fuel pump in the early car that had them. 1973-?

I was originally planning on replacing the stock pump because I thought mine was going out. It's noisy. Here's the one I was looking at bu the JC Whitney one looks similar and the price is right if you want to go for the stock look.

http://www.drivewire.com/nissanparts/catalog/nissan720fuelpump.html

I was looking at that one too. Chino240Z said he had 3 of those fail on him. Based on that, I bought this Carter pump: http://store.summitracing.com/partdetail.asp?autofilter=1&part=CRT%2DP4594&N=115&autoview=sku It's even cheaper. I also baought a regulator to reduce the pressure to 5 PSI. This is going on an '83 L28 with the F54/P79 combo. I have not figured out the wiring yet though.

Marty

[240ZX]

As Arnie mentioned, most of the aftermarket pumps are a diaphram type pumps and are noisy. A gear type pump is generally more expensive but quiet!

[=Enigma=]

As Arnie mentioned, most of the aftermarket pumps are a diaphram type pumps and are noisy. A gear type pump is generally more expensive but quiet!

Both the Carter and the Holley mentioned are rotary vane pumps. No diaphrams here, but motors can be loud too.

[Marty Rogan]

I used a Summit low pressure cutoff switch as my safety switch when i converted to an electric fuel pump. the model number was SUM-G1438. http://store.summitracing.com/partdetail.asp?part=SUM-G1438

They have a pdf that you can download that has the wiring diagram for the switch and fuel pump. You'll also need a relay for this to work, but the pdf covers that too.

How much oil pressure does the engine make while cranking during start up?

If the float bowls are empty, will I have a hard time strting the car?

TIA,

Marty

[Arne]

If the engine gets enough pressure to shut off an idiot light (and it should, most idiot lights trip at 5-10 psi), it would be enough to trigger the relay and run the pump. Watch your gauge while the starter is running, if the needle lifts off zero while cranking, you should be OK.

[kmack]

How much oil pressure does the engine make while cranking during start up?

If the float bowls are empty, will I have a hard time strting the car?

TIA,

Marty

Most oil pressure cut-out switches have a separate terminal that is hooked into the starter loop. That way, whenever your starter has power (ie: you are cranking), then the pump will also get power. I added this setup to my motorhome. The switch I got was from Holley, and it ran about $8. Simple to install.

[tttz]

If the float bowls are empty, will I have a hard time strting the car?

TIA,

Marty

Marty,

The Summit oil pressure switch has instructions for an optional bypass button which allows you to turn on the pump with zero oil pressure. I find that if the car hasn't been driven in awhile, it is helpful to "prime" the float bowls by using the bypass button to start the fuel pump for a few seconds before I try to start the car.

Also, I would guess that you can wire any switch to have this bypass feature.

my 2 cents,

Ty