Fuel sender ohm setting question
Thread Starter
|
Tuned
Joined: Oct 2004
Posts: 380
Likes: 21
From: Las Vegas
Fuel sender ohm setting question
I have a 76 f150. I got it "not running", so don't know what it read before.
When I fill my tank, my gauge reads full plus a lot - like another 1/4 tank to the right. It runs out of gas - I know this for sure! - at 3/8 tank.
So I've read a lot of the threads on this topic and got a much better understanding of how the whole system works.
I pulled the sender and ran some measurements with my ohm meter. At "full" by float position, I get about 10 ohms. At "empty", I get about 68 ohms.
If I manually position the float so my gauge reads right at full, I only need 24 ohms.
Is there a sender that fits my 76 tank that runs from about 24 to about 90-100(?) ohms? I have to guess at the resistance for empty because I can't get more than abt 70 ohms from my sender, which still only reads at 3/8 full.
I sure would like to have a gas gauge I could rely on! Thanks for any help!
When I fill my tank, my gauge reads full plus a lot - like another 1/4 tank to the right. It runs out of gas - I know this for sure! - at 3/8 tank.
So I've read a lot of the threads on this topic and got a much better understanding of how the whole system works.
I pulled the sender and ran some measurements with my ohm meter. At "full" by float position, I get about 10 ohms. At "empty", I get about 68 ohms.
If I manually position the float so my gauge reads right at full, I only need 24 ohms.
Is there a sender that fits my 76 tank that runs from about 24 to about 90-100(?) ohms? I have to guess at the resistance for empty because I can't get more than abt 70 ohms from my sender, which still only reads at 3/8 full.
I sure would like to have a gas gauge I could rely on! Thanks for any help!
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Fuel Sender
With the float rod against the full stop (away from the fuel filter), the ohmmeter should read 8-12 ohms of resistance. With the float rod against the empty stop, it should read 60-68 ohms. If the resistance is not within limits, replace the sending unit.
Gauge
Bench Test
If the ohmmeter reads below 10 ohms or above 14 ohms, replace the gauge.
If the above tests are OK then you might change out the gauges 5-Volt Voltage Regulator on the back of the cluster.
With the float rod against the full stop (away from the fuel filter), the ohmmeter should read 8-12 ohms of resistance. With the float rod against the empty stop, it should read 60-68 ohms. If the resistance is not within limits, replace the sending unit.
Gauge
Bench Test
If the ohmmeter reads below 10 ohms or above 14 ohms, replace the gauge.
If the above tests are OK then you might change out the gauges 5-Volt Voltage Regulator on the back of the cluster.
Last edited by subford; Apr 2, 2007 at 07:30 AM.
Thread Starter
|
Tuned
Joined: Oct 2004
Posts: 380
Likes: 21
From: Las Vegas
Hey, subford, thanks!
I haven't checked the gauge for ohms. I went and got a new sending unit and checked its values, too. I got about 10 at full. By bending, just slightly, the stop tab for empty a bit further back, I got 80 ohms.
At 80 ohms the gauge just reads on top of the empty line. At 10, it still rises at least 1/4 past full - not such a big deal to me. I just didn't want a false reading regarding my low fuel level.
I will check the gauge, too. Does it have a resistance value deliberately built in? Since I have been consistently high on indicated level, might the gauge now have 0 resistance? A constant lack of 10-14 ohms seems just about right for my readings.
I haven't checked the gauge for ohms. I went and got a new sending unit and checked its values, too. I got about 10 at full. By bending, just slightly, the stop tab for empty a bit further back, I got 80 ohms.
At 80 ohms the gauge just reads on top of the empty line. At 10, it still rises at least 1/4 past full - not such a big deal to me. I just didn't want a false reading regarding my low fuel level.
I will check the gauge, too. Does it have a resistance value deliberately built in? Since I have been consistently high on indicated level, might the gauge now have 0 resistance? A constant lack of 10-14 ohms seems just about right for my readings.
Thread
Thread Starter
Forum
Replies
Last Post
cx300
1987 - 1996 F150 & Larger F-Series Trucks
3
Oct 13, 2014 05:37 PM
Wayne Waldrep
1948 - 1956 F1, F100 & Larger F-Series Trucks
29
Jun 7, 2014 08:56 PM
Rokcrln
1948 - 1956 F1, F100 & Larger F-Series Trucks
3
May 3, 2011 08:02 PM
924x2150
1987 - 1996 F150 & Larger F-Series Trucks
18
Aug 29, 2005 09:49 PM
