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#1 |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 171
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In my '94 I'm noticing when the fuel gauge reaches reserve, I am only able to get about 13.5 gallons of fuel into the tank. What are others seeing? My '87 with the same size tank usually accepts around 18 gallons, give or take, when it hits reserve at something like 50 miles of range to go. Unfortunately, I'm trying to fix a flashing SYS on my 94 central dash display, so I don't have access to the digital range at this time.
I've read Marc's article on heavyweight Z's, but it sounds like the issue was fixed in late '93 and subsequent cars should be able to use the whole tank. http://www.zr1specialist.com/HAT%20W...0discovery.pdf
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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#2 |
![]() Join Date: Apr 2007
Location: Northern VA
Posts: 2,655
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Had a similar problem with my 94.
Solved it by pulling the sender/pump unit and enlarged the vent hole on the side of the fill pipe to 1/2". Now it fills to 18+ gallons at the gas pump without having to spoon feed the last gallon or two. Sent from my iPhone using ZR-1 Net Registry
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
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#3 |
![]() Join Date: Jan 2012
Location: Wisconsin
Posts: 887
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At reserve, I can put in 17 gallons.
FWIW ... I replaced my sending unit a few years back. The new one is "non-linear" - it will show Full for a long time, and then it goes through the middle of the range "faster," but it slows down near the bottom of the scale.
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1990 ZR-1 #2180 Red/Black Many of the usual mods for 460HP, tuned by Marc Haibeck ZR-1 Net Registry Member #1548 ![]() |
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#4 | |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 171
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Just to be clear, you are referencing this little pinhole? IMG_8129.jpg |
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#5 | |
![]() Join Date: Nov 2016
Location: New Brunswick
Posts: 951
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1990 ZR-1 # 996 "All Corvettes are red. The rest are mistakes." - John Heinricy |
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#6 |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 171
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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#7 | |
![]() Join Date: Nov 2016
Location: New Brunswick
Posts: 951
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Thanks.
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1990 ZR-1 # 996 "All Corvettes are red. The rest are mistakes." - John Heinricy |
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#8 |
![]() Join Date: Nov 2014
Location: WI
Posts: 121
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Hit reserve, I put in 16.5 gallons.
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#9 | |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 171
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I drilled mine out to ~3/8" when I had the sender out to swap fuel pumps. I haven't driven it enough to get to reserve and see if I'm now able to get more than 13.5 gallons in, but I did top it off and she filled nice and fast right to the top. |
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#10 |
![]() Join Date: Jan 2024
Location: Boston, MA
Posts: 171
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With Phil's tip I am now able to put in ~16 gallons when I hit reserve.
__________________
1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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