Installing a Fuel Pump into an S15 - Ive done the basic mods to my car...exhaust, intercooler, boost, air filter. This is the basic of bolt on bits. This is where things start to get a little more serious...with fuel system upgrades and engine management upgrades. While still compiling funds for my much needed PowerFC & Hand Controller - I bought a new fuel pump and today...I just installed it.

I got a Walbro fuel pump and it flows 250L/h and is good for up to 500hp.

The installation is pretty straight forward. The fuel pump is a direct bolt in replacement for the Nissan OEM pump. In the S15, pull out the carpet in the boot...and the access panel is on the "shelf" that is in the boot. ...



Undo the 4 bolts holding the cover in place - and this will give you access to the breather hose, fuel line, return line and power for the fuel pump. In this pic you can see the power plugs have already been disconnected. Before attemping to remove the fuel lines - its important that you release any pressure inside the fuel system. We depressurised the system by simply pulling off the fuel hose and bleeding it. Or...if you don want the fumes, simply start the engine and drain the fuel system until the engine dies.



Disconnect all the tubes and unscrew the black "locking ring" holding everything down. This is a huge "ring" around the white plastic cover that the hoses connect to. This unscrews anti-clockwise, and you need to be rough with it. We had to do mine by getting a screw driver & hammer, and tapping it undone because it was too stiff to undo by hand. Once you get is undone - you now have access to inside the fuel tank, and to the fuel pump.



The fuel pump is attached to a metal bracket, which is up against the rear passenger seat side of the fuel tank. You can reach in to grab it and pull it out, be careful and move it far left/right to manouvre it appropriately to pull it out, sometimes the fuel float will make it difficult to remove.



Once it is out - this is what it looks like. From the top down, you can see the fuel pump pick up filtration thing, the fuel pump itself attached to the metal bracket, the connecting hose (for pumping fuel) and the associated wire (for power), then the top plastic cover (this is the bit you saw earlier in picture 2)



Here is a comparison between the OEM pump and the Walbro pump.



Remove the old fuel pump (you just unclip it) and attach the new fuel pump. As I said - its a direct bolt in replacement. Attach associated hoses and plugs (you can use the OEM power plug on the new pump - it clicks straight in). Now the fuel pump is ready to go back in.



Then End..

Yep - the standard fuel pressure regulator will be upgraded in the near future (after I get a PowerFC).

Noel...................you didnt do one part of this installation. one very important part...........

REMOVE the valve in the fuel line. in the last pic it is right near your hand..........this valve restricts the pump ALOT when you start using any real power out of it.


other than that BRILLIANT tech article

It will be fine untill you do engine management, but probably easier to do it , while it is all still fresh in your mind.

The stock ecu will be fine with the valve in there thou.

Cool Article. I got the same Fuel Pump in my Laser. Its fairly noisy But good pump and small

I had the same pump in my last ET, worked like a charm, good article too, will be doing the same mod to my 200 very soon.

I just did the exact same installation on my 200sx. How much of a bitch is it to get that screw cap off?!?! i lost alot of hair tring to undo that thing!.

Also after i installed my i find that my fuel gauge needle moves around more eratically now, as if i bumped something, needle will move down n up as i go around corners, anyone know what could have caused this?

Pang: isnt fuel level measured by a float on the fuel pump harness thingy? or is it seperate on the Nissans? the only fuel pump/talk ive ever looked at was a VH commowhore.. it had a floaty device. if so, it may not be secured properly or at the right angle.

Thanks for the info, great help.
I own a S13 so they should be similar if not the same yeh???

yeh pat usually, in my s13 it was. but correct me if im wrong there is no obvious floaty in the 200sx fuel tanks!

great article.. assisted me when i did it in my s13.. please correct me if im worng but there is no valve in the s13.. either that or i missed it in mine!!

am doing mine today.. lets see how a girl goes do we know about the S13 valve anyone anyone??

Did ya mention disconnecting your battery before playing with electrical wiring near fuel?? I didnt see it typed anywhere..Any how, great how2article


NOTE: Disconnecting battery can cause loss of some memory in your ecu..may take a few minutes or days to "re-learn" some things such as TPS, etc..

REMOVE the valve in the fuel line? Is it ok to remove this on a standard s15 spec R ?? and what do you gain from it cheers.,

yay, great post. the images helped a lot. thank you!