How many gallons of gas when at "reserve" marker? - ZR-1 Net Registry Forums

scorp508 · 1 Week Ago

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

Jagdpanzer · 1 Week Ago

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

ghlkal · 1 Week Ago

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.

1 Week Ago	#1
scorp508 Join Date: Jan 2024 Location: Boston, MA Posts: 117	How many gallons of gas when at "reserve" marker? 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 __________________ 1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red

1 Week Ago	#2
Jagdpanzer Join Date: Apr 2007 Location: Northern VA Posts: 2,649	Re: How many gallons of gas when at "reserve" marker? 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 __________________ Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake

1 Week Ago	#3
ghlkal Join Date: Jan 2012 Location: Wisconsin Posts: 886	Re: How many gallons of gas when at "reserve" marker? 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. __________________ 1990 ZR-1 #2180 Red/Black Many of the usual mods for 460HP, tuned by Marc Haibeck ZR-1 Net Registry Member #1548