Sputtered to Stop......Now Runs Fine.
 

Where's the OE fuel pump relay? It's not in the fuse box at the battery, by the ecu nor fuel pump and can't find it in the owners nor repair manual on Nico website.

179 miles into a 180 mile trip and with 1/2 tank of fuel (later physically confrimed) mine sputtered twice then turned off as if running out of fuel. I shut the ignition off then back on and didn't hear the fuel pump prime. The next day I went back to it, keyed on, fuel pump primed, it started and drove fine for the last mile to my destination.

New Fuel pump motor only (OE) and pick up sock replaced approx. 3k miles ago, never run the tank below 1/4 on the gauge, physically pulled the entire assembly a few minutes ago and it's full intact. No wires loose, no hoses coming off nor split, no junk on the sock and no crap in the bottom of the tank. No codes present.

Scouring the manual for a fuel pump driver module or relay etc. now. Kinda hesitant to drive home and get stuck on the highway.

Any other insight would be greatly appreciated. :tiphat:

Did you make a HARD long right turn, this is a Z fuel tank problem, not enoughf baffles all the fuel goes to the left side and starves the pump on the right, this has been reported to happen with 3/4 tank full, CJM ans Z1 motorsports has a solution for this, gl pal.

No sir, driving dead straight. cornered hard with less than a half a tank and never had an issue. I confirmed half a tank in the fuel pump side this morning when I pulled the assembly.

I’ll check into that fix for future needs though.

Did you check the lid of the IPDM? It shows location of fuses and relays inside the IPDM. The relay may be buried under something else. If it's not in the IPDM, the FSM (if you can find a copy; Nissan sent out take-downs to the sites that were hosting it) will tell you where it's located. Or wait a little bit and someone else will chime in.

I confirmed it is most likely an integral part of the IPDM and not individually serviceable. IE entire IPDM needs to be replaced to get a new fuel pump relay.

I took a look at the area where I sputtered to a stop and there was a (non-stop) right hander that bypassed the intersection. The wife was in the car so it was taken moderately at best, definitely not HARD. The car sputtered to the stop about 1000' later.

I confirmed 7 gallons of fuel in the tank upon filling it up last night before driving home 180 miles without issue.

If that sort of turn with 7 gallons of gas in the tank is going to cause this type of issue I'm incredibly disappointed with this car! And $500 for the Anti-Starvation kit from Z1 is a complete customer rip off for a pump that costs $65 everywhere online.

If you have a buddy that knows how to use a soldering iron (a dying art), he/she should be able to replace the relay.

I can do it but there's nowhere I can find that maps which is the fuel pump relay. I found which wires are ground and power to it but they're in separate harnesses within the IPDM. :shakes head:

I was also just reading the Track section of the forum where owners had secondary pumps mounted in the drivers side of the tank (LIKE the Z1 kit) and removed them due to overheating. I don't know that I'd have that issue considering I'm not tracking and never run the tank below 1/4 level though. Again, the Z1 kit is just very expensive for what's included, hard pill to swallow.


I'd love to find a solution using just fuel tank foam. Searched foam over in the track section and it doesn't look like anyone's been successful in that endeavor though.

Maybe someone will post a wiring diagram or other info to find the relay location.

Workshop manual shows it in the wiring diagram but not a physical location within the IPDM. I scoured the workshop manual, owners manual, google, this site, and FB yesterday for 2.5 hrs. to no avail.

check your camshaft position sensor, had the same symptoms.

Thanks. How did you determine yours was the issue? I have no codes stored.

Those that have installed the Z1 kit or the CJM RRP kit to my knowledge have never removed those kits once installed. Phunk's kit is bullet proof. I been running his kit for a couple of years now. :tup:

I believe you had fuel starve. You're not the first to have it or the last.

Oh I’m well aware of that issue. I’d love to know for sure though before throwing $500-1000 parts at it from Z1 & CJ only to find out its the pump, relay, cam sensor or crank sensor on the fritz.

Go to Autozone or O'Reiley's and get a free OBD2 scan. My hometown Nissan tech advisor I built a great rapport with told me it could possibly be my vtc sprocket sticking. My Z is @ 100k miles and I just installed new camshaft position sensors. Will get a thorough sensor scan at the Nissan dealership and update you.

No codes. Scanned with my onboard Torque app when it happened and an OBD2 scanner at the house. Like to hear back on your issue though if it’s similar.

Inspected and tested coil packs, no burns and all passed the manual's resistance testing.

Does the car still run ok?

Yes. Drove 160 miles roundtrip last weekend without issue. It was similar highway driving then side street like when it died. I still don’t have confidence in it to very drive far though.

You had fuel starve.

Dang, with 10 gallons in the tank? Only took 7.5 upon filling the next morning. I know of it with track cars but that much fuel and a typical intersection turn will cause it too? That will seriously make me consider selling. Its not worth the two options to solve it with one being VERY costly and the other a hack imo.

Trying to find out the O.D. (Mm) Of the pick up port the sock mounts on as Holley has only 1 hydromat size option for direct fuel pump mount.

Fuel starve will effect some Z's more then others. Some will never get it. Others will starve at around half tank on the street. On the track. Some have starved at 3/4 tank. On the street. It could be driving habits/ style. Most of your off ramps/ on ramps are right turns. Some are hard turns if you push it. Most people are more comfortable making right turns than left turns. If the fuel pump was on the drivers side of the car. I don't think we would be talking about it as much. Phunk has a great understanding of the fuel system in the Z. He knows all of the in's and out's, and short falls.

Here's my thread on phunk's RRP kit install. There's pictures in the thread you might look to look at. :tup:

http://www.the370z.com/track-autocro...p-install.html

Update.

Did nothing so far and the car has been running fine. Had a buddy hook his ship Snap-On scanner to the fuel pump leads and it has a perfect waveform draw, nothing excessive nor erratic.

I confirmed the OE Pump inlet at 11.7mm so the Holley Hydromat should work as an alternative pick up sock.

Did it again today while idling in a parking lot after 1.5 hrs on the highway. Wife called me inside the store and said it sputtered and recovered twice and the third time died. When I got back to the parking lot it cranked many times before starting then sputtered as I gave it throttle and died. Half tank of fuel sitting in a level parking spot.

Replaced the entire fuel pump assembly due to the post directly above ^^^^^

Car starts without issue every time now when heat soaked, no more long cranking issue. Hope it was a a bad fuel pressure regulator.

Let's see if it helps with the stalling and not restarting issue.

I have seen this before ^^^^^. The pump just takes a dump when hot. It happens.

The first time it happened in Sept. of 2018 the pump motor was only 3k miles old, then didn't happen again until last weekend. I took the exact trip as last weekend at least a half a dozen times without issue. Very frustrating and as previously stated hoping replacing the entire assembly with a new OE plus CJ hat fixes it.

New OE pump (full assy) and CJ hat fixed the issue. I'm sure the integrated fuel pressure regulator was on the fritz.