Z died on me :( Fuel pump?
 

I've been hearing a faint high pitched whine coming from the passenger side for the past week and just yesterday the car would crank but bog violently and shut down upon ignition. My guess is that the fuel pump is done. Not only the noise was coming from that general direction, I do not hear the fuel pump engaging before the engine fires.

Anyone know why/how the fuel pump would fail? I have around 65k on the odometer. In addition, anyone know the estimate on this repair?

If you do not hear it priming when turning on the ignition then that's a dead giveaway. It's probably gonna be around $500-600 from an independent shop. Most pumps are on top of the tank so you have to drop the tank down and pull the old pump out to install the new one.

A whine from the passenger footwell area is probably the ECM. The fuel pump is located behind the seats. See FSM (link in my sig) for location details.

If no fuel pump whine when you try to start, I'd first check the fuse(s) (see Owner's Manual or FSM for location).

The noise is coming from behind the passenger seat. I'll check the fuse. Thanks:tup:

Fuel pump should is a reasonably easy to replace. I would pick up an OE replacement and have an indie mechanic fix it for you if the stealership wants blood in exchange... or DIY =)

Changing the 370z pump don't need to drop the tank.
Can be done in about 1 hour by yourself. Did mine with the instruction from CJ Motorsports

http://host.cj-motorsports.com/pdf/3...ump%20Tech.pdf

Thank you. As much as I would like to work on this myself, I am extremely busy these days and I need to car asap. I'll just bite the bullet and let a shop handle this one for me. But I think I should print and hand them this instruction :)

IIRC, there is a relay to supply power to the pump. This would be another easy/cheap check before deciding to replace the pump.

I was about to say check the relay first....but changing the fuel pump can be done in an hour maybe 2 for the virgin fuel pump changer

Actually, I might just do this myself. Do you guys recommend Walbro? And is it really necessary to change the pump with 1/8 tank of gas? I have about 2/3 of fuel left in the tank.

Thanks

If you're willing to travel to OC, I would recommend taking your car to Corner 3 Garage in Laguna Hills. They are very familiar with this problem and are capable of doing an OEM fix or an aftermarket upgrade such as the CJM kit if you are so inclined.

I wonder if the top hat just broke like has happened to many others recently. IF so, Phunk (CJM motorsports) can fix you up.

Unless you are going to do some serious upgrades and a custom tune the walbro is overkill and will require more modifications to the fuel pump assembly just to get your fuel pressure down to normal at idle. I am TT and run the walbro and it flows enough to make almost double the factory horsepower.

I think you're better off with an OEM or OEM equivalent pump. It's a pretty simple DIY though, so I say go for it! =)

Hmmm I placed an order for Walbro this morning. Should I cancel the order? How bad is installing Walbro on a N/A engine? I bought this because it's affordable, easy to install, and had good rating.

If you can cancel I probably would... Doesn't really make sense unless you're planning more upgrades to make any use of it. But if not, you can make it work.. just a little more work. I assume it's the 255lph?
Check out the cj Motorsports site there are some guides... You can also post on his threads here (user phunk) he is the resident fuel system guru for the community and is very helpful.

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Interjecting another related question. Should the fuel pump be changed at a certain mileage or just if it dies?
I'm over 119,000 and wonder if I should replace.

Thanks to loiro370z for the instructions.

I probably wouldn't worry about it... playing the what-if game in that way could lead you to replace a ton perfectly functional parts throughout the car.

If you do install the 255, you will need some installation components:

A new hose to connect the pump to the fuel filter inlet: The stock hose is PTFE and is usually cut off in order to remove. Although someone experienced in using PTFE hoses could probably extract it and re-use it.

A centered fuel pump strainer: The stock one will technically fit the Walbro 255, but it doesnt really hold snug to it.

A method of supporting the fuel pump. The Walbro 255 will not interface the factory fuel pump retaining ring... so you will ultimately end up cutting this ring out. The pump will be pretty loose in there without something to support it. We used to make a billet part for it but now we use fuel pump support foam and it works great and is very easy.

We do have all these items in a single kit just for this exact purpose: CJM Fuel Pump Install Kit, 370z | CJ Motorsports

Also, someone mentioned possibly having to make other modifications to correct fuel pressure after installing a 255. This is a yes/no/maybe sort of thing. What happens is, the greater amount of fuel that the regulator has to bypass at idle can back up behind the regulator, not allowing it to do its job at idle when the engine is consuming very little fuel. This can cause an idle pressure spike. With a 255, in many cases, the pressure spike at idle wont have a noticeable effect for the owner. Sometimes it will just contribute to taking another crank or so to get the engine started. But the actual Air/Fuel ratio at idle will generally correct itself through o2 sensor feedback.

If you wanted to take the extra step to reduce this effect, the PDF linked earlier in the thread will show you where to drill a part a little bit larger to correct the fuel pressure spike. I would just barely open it up from stock if doing it for a 255.

Wow what a ton of misinformation and jumping to conclusions. Drop tank for fuel pump? Seriously that is really uncommon and only car line I know that still requires that in cars is GM (because they are stupid, coupled with one of the most common manufacturers to have fuel pump failures makes them double stupid). Now if we are all going to just guess what went wrong I'll throw my own random guess and say fuse for ignition coils (just guessing since my breif 2 min look in FSM I couldn't find ignition diagram but typically one fuse feeds all power supply to coils). Anyway not trying to be a **** but point was to take some test before wasting money on the wrong things.

Anyone know which fuse to test for the fuel pump? I've looked at the owners manual and past posts about similar issues but I just cant seem to locate the fuse I'm looking for. Any help is appreciated :)

Got a stock fuel pump if u need one. Hmu.


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