Results 1 to 11 of 11

Thread: Please donfirm that my gas guage is "normal"

  1. #1
    Registered User sdyck's Avatar
    Member ID
    CZCC-30672
    Join Date
    Jul 2014
    Location
    Calgary Alberta
    Age
    57
    Posts
    32

    Default Please donfirm that my gas guage is "normal"

    '72 240Z

    My gauge sort of works, when I fill up it goes to full, but then it drops quickly to half full hangs around there awhile then slowly drops to about 1/8 full which is generally when I refill it. The odd thing here is when I fill it from 1/8 full I can only add around 10 gallons. Which means I have 5 or more gallons left.

    At first my searches led me to believe that my float may be filingl with gas and acting strangely as a result> but then I ran across this post from an admin over at Hybrid;

    "The shape of the gas tank makes the first 1/2 of the tank go really fast in relation to the last half on the gauge. There is a lot more volume in the tank when it reads the bottom 1/2 of the gauge. Also the fuel senders are not the latest and greatest design and they tend to not be accurate, especially after 30+ years of service."

    Can anyone confirm that?

    ThankZ
    Last edited by sdyck; 09-08-2014 at 02:47 PM.

  2. #2
    Low Budget/High Value
    Member ID
    CZCC-20342
    Join Date
    Oct 2009
    Location
    Washington County, OR
    Posts
    3,629

    Default

    That's about what mine does, 1976 280Z. It will sit right on 1/2 full with the trip meter from 100-150, then drop to just above E at 220 miles. So I get 100 miles above 1/2, 50 miles at 1/2, and 70 miles below 1/2. Consistently.

    Then I can get about 12 gallons in on a refill, so apparently I'm 5 gallons paranoid (early 280Z's have a 17 gallon tank). I've never seen the red warning light come on, don't even know if it works. I've hit 280 miles on the tripmeter, but it makes me nervous, even though I know that fuel is in there. Always calculates out to between 18.5 - 20 mpg.

    I need to take it down to the red light some day.
    1976 280Z, with some minor modifications

  3. #3
    Registered User olzed's Avatar
    Member ID
    CZCC-20649
    Join Date
    Dec 2009
    Location
    Auckland. New Zealand.
    Age
    76
    Posts
    1,069

    Default

    I can confirm that my 240's tank still has fuel when the gauge needle does not move.
    Tank was sucked dry of fuel when at the paint shop, and i drove it home not noticing.

  4. #4
    Registered User siteunseen's Avatar
    Member ID
    CZCC-24724
    Join Date
    Jul 2011
    Location
    Alabama
    Posts
    1,967

    Default

    I agree. Back when I had my first Zs the gauge would go waaaay past E. Now that I can afford to fill them up, when they're on or near E, they only hold about 10 gallons.

    I'm learning the gauges in these cars were/are their shortfall.
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

  5. #5
    Jim Arnett jfa.series1's Avatar
    Member ID
    CZCC-22303
    Join Date
    Aug 2010
    Location
    Richardson TX
    Posts
    764

    Default

    I had a similar experience recently after a rare fill-up. While on the road I noticed a pretty rapid drop in the gauge, figured I was really burning a lot of gas, and had the "aw sh-t" moment. Then the gauge slowed noticeably and I realized it was the step in the fuel tank causing the different rate of change in the gauge. Most of the time I only give my little garage queen enough fuel for local events and I had completely forgotten the effect of the tank shape. I really need to check my mpg and how much gas I can get into the tank.

    Jim Arnett
    HLS30-15320 12/1970, original owner
    L24-020208 (original)
    IZCC Original Owner Registry #53

  6. #6
    Registered User Bonzi Lon's Avatar
    Member ID
    CZCC-11300
    Join Date
    Apr 2006
    Location
    Kingman, Kansas
    Age
    65
    Posts
    1,155

    Default

    The Hybrid statement is correct, the tank is 'L' shaped, more fuel in the lower portion than the top. Also, the fuel sender unit is not wired for an 'L' shaped tank, the resistor windings, but more like a rectangular one.

    During the refurbishment, the tank was boiled, sealed and new sending unit, works as described, top half of the tank goes real quick on the gauge, then slower for the last half. On long trips I have found it will run about 2 1/4 gallon per hour, 26.5mpg highway, so that can help with calculating amount of fuel left. I've ran the needle down to cover the empty hash mark, but still had enough to get to the station. Would still like to know how low it can go before the engine quits.

    Bonzi Lon
    1973 HLS30-168500
    1968 SPL311-18100
    1969 HLS30-000110 SOLD Shipped to Dubai UAE
    CZCC#11300

    Ones and Zeros

    "We drive only blue cars." Dishwalla

  7. #7
    Registered User sdyck's Avatar
    Member ID
    CZCC-30672
    Join Date
    Jul 2014
    Location
    Calgary Alberta
    Age
    57
    Posts
    32

    Default

    Thanks, good news that I don't have anything to fix, bad news that I can't rely on the guage.

    My calc's show I'm getting 15 mpg city, ( I'm in nead of a full tune), I guess I'll have to get used to setting the trip meter rather than relying on the guage. I should be able to get 200 miles out of it and leave at least 2 gallons.

  8. #8
    It's awesome bartsscooterservice's Avatar
    Member ID
    CZCC-28929
    Join Date
    Jan 2013
    Location
    Gendt, The Netherlands
    Age
    33
    Posts
    857

    Default

    I have a similiar thing, and I installed a new " NOS from Ebay" fuel sender since I was refurbing the tank anyhow. Funny the old one seemed more accurate to me ? Also does anyone have problems when filling up, I find the filler neck very small for today's fuel filler pistols from the gas pump, I cannot go full " throttle " on the fuel delivery..

    The 240Z's float reminds me of the one I find on the Chinese scooters today...sometimes they work great, sometimes not.. but I have found this problem on the scooters to be a small clip that has been pushed down to hard in the factory making the float not move easily, so with a small screwdriver I go under the clip to give it some room, and most floats work again after that.
    Last edited by bartsscooterservice; 09-10-2014 at 12:40 AM.
    HLS30 32581, 5/71 Matching numbers

    Jay Leno : You know one week after the Americans have walked on the moon, the Japanese introduced this sports car, and…if you’re a car guy pretty equal. I mean walking on the moon was pretty good, but how many times you’d gonna walk on the moon? But here was an affordable sports car that had real performance and looked like it cost a lot more than it did.

  9. #9
    Registered User sdyck's Avatar
    Member ID
    CZCC-30672
    Join Date
    Jul 2014
    Location
    Calgary Alberta
    Age
    57
    Posts
    32

    Default

    I can go "full throttle" when filling but it does tend to click off a couple of times, so I'm never sure I'm actually full.

  10. #10
    Registered User LeonV's Avatar
    Member ID
    CZCC-19146
    Join Date
    Apr 2009
    Location
    Bay Area, CA
    Posts
    1,961

    Default

    I always fill the Z tank slowly. Have to do the same on my S2000, strangely enough.
    2/74 260Z

  11. #11
    Lance Corporal of Marines TheCrazySwede's Avatar
    Member ID
    CZCC-27820
    Join Date
    Aug 2012
    Location
    United States
    Age
    26
    Posts
    76

    Default

    Same thing in my '77 280.
    My gauge isn't fully functional, though. It never goes past half (the needle stays in the middle) even after a full-refill. Then, after about 150 miles, it drops and hovers right above E. To refill it takes around 10-11 gallons.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. What is considered "normal" oil use for SU carbs?
    By Otto Skorzeny in forum Carburetors (S30)
    Replies: 12
    Last Post: 09-18-2013, 07:16 PM
  2. Should a Strut Bar "Push" or "Pull"
    By Victor Laury in forum Suspension and Steering (S30)
    Replies: 13
    Last Post: 05-29-2007, 09:13 AM
  3. "Drecord" is changed to "Dreco"
    By Dreco in forum Open Discussions
    Replies: 0
    Last Post: 08-01-2003, 10:14 AM
  4. Meaning of "PMC.S" & "Racing Mate" ?
    By Cuong Nguyen in forum Open Discussions
    Replies: 4
    Last Post: 02-07-2003, 06:17 AM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •