Fuel Pump Assembly Broke
 

Took off the fuel pump assembly only to find out the reason why the Z wont start... the assembly was literally just hanging off.. is this a common issue where the fuel pump assembly just breaks off??
I drive my car fairly normal, no track.. 09 370z 100k miles

Was wondering if I should try to DIY fix it or just find a replacement fuel pump assembly.

It broke away from the top Hat....you can get a billet Hat from CJM Motorsports & those metal rods will push into the hat & be anchored in by set screws :tup:

Normally you would heat those plastic tits up with a heat gun & pull the rods out,,,they have a small nipple on them. I haven’t seen one break off before; unless someone has mishandled it in the past :ugh2:

Screenshot of hat.

Others will chime in & help,,,as that bottom piece is a basket for the fuel pump & filter assembly to sit in. It unclips from the housing. There’s a strainer on the bottom of the pump & notice the fuel line does a 180* from the pump....as it pipes back down through a built in paper filter & then up to the top.

WoW...there’s the billet Hat...with a modified pump assembly :tup:

Yup, I had the exact same failure. The CJM hat is a nice piece. You do have to cut off the factory wiring harness connector and replace it with one that comes with the hat.

This failure is starting to become more common. phunk is ahead of the curve on this.

Unsure how long the oem paper filter last (before stopping up) others may know. You may be able to install a new one (in tank) without adding a new fuel line & making a return system,,,as the oem internally regulates fuel pressure & uses bypass pressure to work a venturi to pull fuel from the other side of tank...that’s the other hose you will see in tank that crosses over...”Phunk” is the owner of CJM Motorsports & he should be able to answer all questions....but his setup is definitely better than OE :tup:

All the OP needs is a CJM top hat.

I have the blue version ;) looks nicer :rofl2:

:icon17:

At least he can probably see the threads of the AN fittings being screwed together,,,gotta have a dang good light with everything black :ugh2:

I appreciate all the referrals from you guys.

Current production runs are bright black with laser white logo. As of 2 weeks ago, the stock type install kit include a swivel bulkhead fitting that can freely spin around (other than when it contacts the plugs of the unused holes). Hoping to update the website to reflect this sooner than later.

No like!

Phunk FTW!

had mine replaced around 21k miles under warranty, yeah its a common issue with nissans

Wishful thinking on the concept by Nissan that has failed many of us time and time again. With 10 gallons in the tank and going around a sweeping right hander on the street with luggage in the car I fuel starved thus losing suction from the LHS of the tank anyway.

I've found the Holley Hydramat 11mm fuel pump pickup sock will fit on our OE pump inlets (11.3mm); however, haven't put it to practice yet. Hopefully will fix the issue with the least time/money investment for a street only car.

It won’t change anything. When slosh starvation occurs it’s because the fuel has sloshed to the left side of the tank. The hydramat will still be in the wrong place in relation to the fuel it’s seeking. It will attach to the pump though, as long as you cut openings in the canister to allow it to fit. But unfortunately it’s not going to to be worth any time or money. To fix the right turn slosh starvation you need to either contain the fuel from sloshing, increase your ability to recover fuel when it does slosh, or get a pickup in the area where it’s sloshing to. A hydramat in the stock fuel pump location won’t be able to address any of this.

Well, I’ve screwed the pooch. I was reassembling my fuel pump assembly & I managed to drop it. One of the locking tabs on the pump housing / filter assembly (that retains it in the outer canister) broke off. Other than just searching on-line, does anyone have one laying around or have any suggestions as to where I can purchase a replacement pump housing / filter assembly?

:icon14:

I may give a try considering the hydramat pickup is much larger than OE and it retains fuel within, whereas the OE does not. Maybe in the street environment it will give enough time for the fuel to slosh back.

Interested to see how it works for you, though it might be hard to quantify the results.

I think the easiest fix for a street car is just to fill up early and often, but who has the discipline for that?

We have a more basic starvation fix in the works but it wont begin to materialize until after we release the new 350z twin pump. Which means its a ways out, probably summer time.

you could find 370z fuel pump on eBay, some of the sellers could give you a life time warranty with an extra money you would pay, I guess I might buy one of these as my fuel pump is giving me an incorrect reading.

Buy new OEM only from Ebay or elsewhere. Used part Ebay sellers will just change their username and leave you hanging on the warranty. The dealers that give discounts to forum members aren't always the least expensive source.

Just had my fuel pump go out on my 2010.

Fortunately, I found this OEM Aisan @ Parts Geek
https://www.partsgeek.com/catalog/20...fuel_pump.html

$173 for 2010-2015, $207 for 2016+ (from what I could tell)

My local mech. couldn't get one from his dealers for less than $550!

He was blown away, says it's the exact same as the oem from Nissan.

While I didn't do the job myself, I understand this can be done fairly easily if you have the work space and proper tools. (there's even Youtube vids)

So my fuel pump is also just hanging around, connected by wires, because the studs broke. Should I just replace the entire assembly with the Aisan? Or are people normally just replacing the top hat (from the quick read, the pump attaches directly to it?)

Get the billet tophat from CJ Motorsports.

Advantage to replacing the entire fuel pump assembly is that you will get a fresh filter in there. They are molded into the plastic housing and cannot be replaced without getting the entire new assembly. So it depends on your odometer reading I would say. If you are getting up there mileage you may want to replace the entire thing or even do both if you dont want it to happen again.

If you do replace it, highly recommended that you do stick with an original Aisan unit. I believe ConceptZ has the lowest prices on them.

billet hat link if needed:
https://cj-motorsports.com/products/...-pump-hat-370z

Thanks guys. It's at 107k, so might just do the entire pump replacement. Cheapest seems to be Partsgeek....or ebay for $25 less

https://www.partsgeek.com/catalog/20...fuel_pump.html

These inexpensive replacements are never original in my experience. If you keep the car stock they can probably work for you, though its unlikely the quality as as OEM hence the savings.

If you end up wanting to do fuel system upgrades down the road, they generally are not compatible with any aftermarket upgrades as they are constructed slightly different. They do appear the same at a glance to someone who doesn't work with them regularly, but if you try to upgrade them and follow along instructions online using off the shelf parts, you will quickly realize that you do not have the same unit as everyone else.

So just be aware of that depending on your plans for the vehicle.

Oh really? You think those are a knock off Aisin part?

This is not?
https://conceptzperformance.com/aisi...71_p_76901.php

I cant say for certain. I just realized that your link was not for one part, but for several different choices. Some of which claim to be original. But I have no way to know without buying and inspecting.

Get an all OE assy. as the fuel pressure regulator is a component of it as well and ya don't wanna play with leaning out etc. due to a failure with that. Simple search helps as well as ebay.