Fuel Problem | The Z Club of Great Britain
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Fuel Problem

Discussion in 'Rebuilds and restorations' started by 4683kelly, Aug 8, 2017.

  1. 4683kelly

    Z Club Member

    Hi everyone,

    I've been chipping away at restoring my 1972 240z for the past few months and finally turned the key a couple of weeks ago only to discover that my fuel pump wasn't working, this has now been replaced with a working original but fuel is still not reaching the fuel filter. I have fitted all new hoses and checked the lines are clear. Not sure what else might be stopping the fuel getting to the engine bay. Does anyone have any advice?

  2. Red7

    Red7 New Forum User

    So you've got an electric fuel pump instead of the mechanical one?

    Have you looked at the fuel rail?
  3. Red7

    Red7 New Forum User

    I have a Facet fuel pump and fuel pressure regulator in mine

    Attached Files:

  4. jonbills

    ZClub Administrator
    Staff Member Committee Member

    Looks like you've got the pump in the engine bay which is not ideal but prob not the problem.
    I'd start by:
    1. Check you got the supply and return lines the right way around
    2. seeing if You can blow through the supply line into the tank
    3. If no, disconnect supply line from tank at tank and try again.
    At that point you'll know either your tank is blocked or your supply line is blocked.
    Last edited by a moderator: Aug 9, 2017
  5. Red7

    Red7 New Forum User

    Jon that's my engine bay :thumbs:
  6. jonbills

    ZClub Administrator
    Staff Member Committee Member

    Ah yes
  7. SacCyclone

    Z Club Member

    Agree that you should look at the pick up point inside the fuel tank for a clogged screen.
  8. Rob Gaskin

    Rob Gaskin Membership Secretary Staff Member Committee Member

    Does the new pump work?

    Feed fuel directly to it from a can etc and see if it pumps when the engine is turned over.

    It may need priming.

    Also try 'Easy-Start' with the help of a friend whilst turning the engine over. That might get the pump started.
  9. Farmer42

    Z Club Member

    I seem to recall that you posted a thread a few weeks back looking for a replacement mechanical pump. I also seem to recall reading somewhere that mech pumps suffer with vapour lock and this can be compounded by a blocked breather hose on the tank as it won't suck the fuel through and expel the air in the pipes.

    As Rob has said, you will need to prime the lines but to aid breathing, remove the fuel filler cap on your tank whilst you are turning it over and also take the hoses off the top of the float chambers on the carbs and ensure fuel pumps out. You can collect it in a jar or something to stop fuel pumping all over your engine. Replace the cap & hoses when you have fuel coming through.

    My advice is to follow what they did with the 260Z and install an electric pump near the tank to push the fuel through to the engine bay which was to overcome the vapour lock.
  10. Sam_C

    Sam_C Forum User

    Did the 260z have a mechanical and an electric fuel pump? How were the lines set up, did the electric pump go to a reservoir or have a return line or...?
  11. Mr Ex Jnr

    Mr Ex Jnr Zeds is the way iv been shown Staff Member

    How are you trying start it by the way

    ie does it have a choke leaver.

    Mine won't start on just a turn of the key

    Have you tried pumping the accelerater pedal for a good 20 seconds or more

    Mine doesn't have a choke but when it hasn't been run for a bit it all avaporates out of the carbs so you have to sit and pump the throttle for good 20 secs then normally catch it on key with some light throttle
  12. tallphil1961

    tallphil1961 New Forum User

    The 260 I have just put on the road after it had been hidden in a garage for 7years had the fuel pickup pipe in the fuel tank blocked by solidified fuel and rush, we used a piece of old house hold net curtain taught and a hand drill to rotate it as we pushed it down the pipe, , also had to remove and clean float needles and wash out main jets with carb cleaner and air line as these were also blocked with a green gunge of old fuel, stared straight up afterwards
  13. Farmer42

    Z Club Member

    Mine certainly has and it has the wiring loom as standard that feeds it. The electric one is mounted on the rear chassis near the tank and is mainly used to push the fuel to the front with a constant pressure. The mech pump sort of regulates the pressure and pumps it to the carbs at the right flow rate (or so it seems). The return line runs from the fuel rail directly back to the tank. I have 2 fuel filters in the lines - one at the rear before the electric pump and one in the engine bay before the mech pump.

    Can't say that this set up is the same for all 260Z though. It sounds like most have done away with the mech pump.

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