Jump to content
SAU Community

Starting Problem, Air In Fuel Rail?

89CAL

By 89CAL,
in General Maintenance

 Share

Recommended Posts

89CAL Grand Master

89CAL

Posted
Posted

Hi

I'm having a minor issue with cold start when the car has been sitting for a while. I wasnt to worried about it but recently I went overseas for nearly 3 weeks and when I got back the car would only just start and ran horribly for about 5 mins

normally but it will either fire first time and die straight away, then next time it fires up alright and idles perfect

Or

fires up, idles jump up and down about 500rpm (between about 500-1000rpm) a few times then it idles perfect.

I had a FPR laying around so decided to change mine in the off chance something was wrong with it. When I pulled mine out I noticed the fuel was slowly bubbling as if there was air trapped in the rail. Left for a while there was no fuel visible through the hole for the FPR

So it looks to me like over time the fuel drains back through the pump to the tank, but I didnt think this should happen. Was fairly sure the pump has a check valve to stop this happening inside it (I have a Tomei intank pump, same as Nismo)

Car also has 555cc Nismo injectors and 255rwkw. Fuel filter replaced not to long ago (Z201 from memory).

I'm wondering if the check valve in the pump has failed or something, or if perhaps I'm missing something.

Thanks

Link to comment
Share on other sites
89CAL Grand Master

89CAL

Posted
  • Author
Posted

Does holding the throttle open slightly help?

When starting? I will try that next time. Are you thinking AAC? because I've pulled it apart and cleaned it not so long ago.

Link to comment
Share on other sites
89CAL Grand Master

89CAL

Posted
  • Author
Posted

Its a good way to diagnose if its too rich or too lean. If holding the throttle open helps then its too rich on start up. If hinders then too lean.

Makes sense :)

I'll try and remember to do that next time I start it in the morning

can you confirm theres a check valve/anti return valve in the Fuel pump to stop fuel flowing back through it?

Link to comment
Share on other sites
DVS JEZ Grand Master

DVS JEZ

Posted
Posted

Ok so it may be too lean on start up which can be caused by the fuel pump voltage. Try the rewire or atleast earth the fuel pump negative direct to the chassis ground

Link to comment
Share on other sites
89CAL Grand Master

89CAL

Posted
  • Author
Posted

I'll have a look tomorrow (if I remember) and make up a little jumper lead to earth it to chassis.

Or I might just do the full re-wire while I'm there

But I have tried priming the car constantly before startup (If I hold my key just before it starts the fuel pump constantly primes) with no improvement

But worth a shot anyway

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • sycotix
      Newbie from Geelong, Victoria

      By sycotix · Posted

      Thought I'd give an update. There needs to be scarce details in some areas due to ongoing discussions. Here's the journey of trying to make the booked registration appointment (again). Sent a complaint to Car Inspect outlining the concerns and made some demands. Went to a service center in Geelong, got assaulted with bullshit items on the RWC, as you know. Tried to quote $2.5k AND wanted a structural report Only seemed to be one place around Geelong that does them, they demand $495 just to end up telling me it's f**ked, at least $11k to fix and tried to sell me his own Skyline in the process (bro, wtf?) Started stressing about what I'm supposed to do with this possible pile of steel. Awaiting that, I was sent an angel friend who works in Melbourne and knows real mechanics and body shops.  They laughed at the reported quotes (don't get work done in Geelong) Car underwent some front surgery and brought back better They then sent it to the mechanics for RWC Registration appointment is two days away at this point. Mechanics pointed out two issues: driver's seat and shocks - that's it. He offered couple options and I chose coilovers. Frantically I scoured the jungle realm that is Facebook Marketplace (again). Found what looks to be a decent Series 1 seat actually - $100 Guy is friendly, offers to bring the seat with a colleague who's heading to Geelong (thanks man, that was cool) Seat arrived, looks good. Throw it in my car and drive to Melbourne and drop it to mechanic T-1 day, mechanic reckons job will be done for the fronts only, gets it done by 4PM Mechanic heads to get the coil-overs that night as a favour to help me make the appointment Get driven to Melbourne, drove the car back - RWC Unlocked! ✅ VicRoads tomorrow, the goal is close now. 🙂
    • r32-25t
      WTB - RH Indicator

      By r32-25t · Posted

      Gtr are still available through the heritage program but don’t have the wiring 
    • joshuaho96
      New topic :0... Japan members what do you drive currently?

      By joshuaho96 · Posted

      I remember test driving this car at Odaiba. All the controls are very light so it's good for commuting. I don't think a 1.2L turbo would make sense in the US though, you would be constantly deep in the boost in highway cruising. 
    • The Bogan
      MLR's Bogan cruise ship

      By The Bogan · Posted

      As the Bogan Cruise Ship has nothing wrong with it, and is perfect the way it is, I have decided to fix that issue, nothing major, just a little tidy up and upgrade some parts that don't really need to be upgraded  1. Upgrade the interchiller, basically another fancy pants modern and efficient condenser, a larger reservoir (current one only holds about 500ml) and a better pump (the current pump has a little rattle, so......while I'm in there.....) 2. Move the battery to the boot so I can use that real-estate to fit in a nice big reservoir where the battery currently is As for a new car, I'm holding off buying one for a few reasons: 1. Not enough garage space for another nice car, yes....I consider the Bogan Cruise Ship a nice car that needs a roof over its head, which leads to point 2 2. I'm buying a joint down the south coast next year, hopefully I can find a joint with a nice big double garage that I can get a car lift in, or, it has a massive shed for lots of cars, and a lift (I really really want a car lift) 3. I cannot decide what I want, a new freshness with all the mod cons, or a fairly old thing that I can play with when I'm bored (old as in steel bumper) In other news, there's a light at the end of the tunnel, and it isn't a train coming to run me over  Not that I'm counting 
    • PranK
      Japan Scrapbook

      By PranK · Posted

      I'M FREE!!!
×
×
  • Create New...