• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

BJ8 Fuel gauge help

G

Guest

Guest
Guest
Offline
I'm having some trouble with an erratic fuel gauge. I'm pretty sure it's the gauge and not the sender. Is there any information out there on the fuel gauge operation. It appears there are to nuts on the back that when loosened allow some adjustment. I'm just not clear on how to go about making the adjustments.

Thanks,
-Ed
 

GregW

Yoda
Platinum
Country flag
Online
Hi Ed,
First thing I'd look at is the ground wire, make sure the metal is clean on the wire's terminal and where it attaches to the gauge. It is not uncommon that the sending unit suffers from poor grounding also. A fix for that is to run an additional ground wire to one of the 6 screws on the sending unit.

P.S. Welcome to the Forum
 

Attachments

  • 10439.jpg
    10439.jpg
    32.2 KB · Views: 249

AUSMHLY

Obi Wan
Bronze
Country flag
Offline
Hi Ed,
Yeah, what Darth Vader said above.

Unless your a qualified fuel gauge tech, don't move the two small bolts/nuts. I've seen what's in there. Maybe you have too. There is a very very small wire that runs across those two bolts. Also, the placement of the two units are critical. If the nuts are lose, that may be the problem. Maybe they have moved. If that is the case, the gauge should be sent out for recalibration. If your asking how to calibrate, maybe some others will chime in on that topic.

If it were me, I'd do what Greg says first. (I always do what Greg says, he's all knowing). If it solves your problem, then.... I would carefully tighten the two small nuts on the back of the fuel gauge. Making sure to keep their position intact.

Good luck and welcome to BCF!
Happy motoring!
Roger
 

Dave Russell

Yoda - R.I.P
Gold
Offline
Hi Ed,
Welcome to the forum.

If you want to see how to do it go here:
https://mgaguru.com/mgtech/electric/electr_1.htm
Scroll down to FG-101, 102, 103, 104.

The MGA gage is very similar to the Healey gages. I believe that the main difference is that the BJ8 has a bit different resistance in the sending unit.

Good grounds on both the dash & tank units are important.

If you loosen the two adjusting nuts on the back of the gage, be prepared to go through the entire calibration procedure.

It's possible to do the job, I've done it, but if you are not comfortable working on small delicate parts it can drive you up the wall.
D
 
OP
G

Guest

Guest
Guest
Offline
Well I'll certainly check the grounds first and then the sender and hope that's the problem.
 

GregW

Yoda
Platinum
Country flag
Online
Thank you Roger. I think it would be more accurate to say I'm some knowing, or know-enough-to-be-dangerous knowing. My first car was a '67 Mustang that my dad helped (showed) me how to rebuild the motor. We added some goodies like a Holley carb and Mallory dizzy. It wound up being too much for the tired old rear end and I sheared the pinion yoke in half, boy was that loud. Junkyard wouldn’t sell just the yoke so I bought an entire axle. I inspected the gears and determined that the ring gear on the original axle and the pinion gear on the newer axle were in the best shape so I did some swapping and installed the hybrid. Car made strange whining noise though, turned out my original axle was a 3.2 ratio and the new one was 3.07. The next axle went straight in with no alterations. :blush:
 
Offline
edscripps, if you do remove the sending unit youll be putting in a new seal/gasket, dont over tighten the six screws just snug them down well in a cross patern, the tendency is to over tighten the screws thinking it will help seal, not so in this case, Ive never used any kind of gasket sealer on them and never had a leak.
 

BJ8Healeys

Jedi Warrior
Country flag
Offline
There are small tabs on the coil holders inside the gauge that fit in the slots on the back of the gauge where the posts slide for adjustment. If you loosen the nuts on the T and B posts and are not careful to prevent the tabs from coming out of the slots, you'll break the internal coil wire when you tighten the nuts (the tabs prevent the coils from spinning when you tighten the nuts).

The MGA Guru website is a great explanation for how the gauges work and the general principals of adjustment. But the data given is for an MGA and the Jaeger gauge, not the Healey and Smiths gauge. Circuit resistances are not exactly the same. These gauges are very difficult to calibrate correctly.

EdScripps: do I have your BJ8 listed in the BJ8 Registry?
 

regularman

Yoda
Offline
I have repaired/calibrated some fuel gauges and senders for some sprites and midgets for folks. That sender looks the same as the bugeye and I imagine the guage works the same too. Let me know if I can help.
 
Similar threads
Thread starter Title Forum Replies Date
Lutz Kramer Fuel gauge and sender unit for BJ8 Austin Healey 2
T BJ8 Tachometer and Fuel gauge stopped working. Austin Healey 27
S BJ8 Fuel Gauge -Shows 1/4 tank when empty Austin Healey 10
G BJ8 Fuel Gauge Core Austin Healey 9
Frank C. BJ8 Fuel Gauge Austin Healey 5
Cutrog1 BJ8 Fuel Tube Installation Austin Healey 10
S BJ8 Fuel Pump Austin Healey 13
B Fuel pipe runs BJ8 Austin Healey 2
Bob_Spidell BJ8 Fuel Pump Trivia Austin Healey 0
M BJ8 Fuel pump Austin Healey 13
J BJ8 PhI ; #25805; Fuel Pump Austin Healey 20
pkmh BJ8 Fuel Tank Sending Unit - Ground Wire Austin Healey 8
Ed_K Correct SU Fuel pump for a BJ8 [ PSI specs] ? Austin Healey 9
AUSMHLY Float bowl fuel height BJ8 Austin Healey 4
N BJ8 out of fuel at 1/4 full tank Austin Healey 4
F BJ8 Fuel Filter Installation Austin Healey 14
L BJ8 FUEL TANK SPOTTED Austin Healey 2
BOBBYR BJ8 FUEL TANK Austin Healey 7
D BJ8 fuel consumption Austin Healey 5
J I need a picture of installed fuel pump for BJ8. Austin Healey 4
JamesD BJ8 Top Frame Bumpers Austin Healey 4
AUSMHLY BJ8 Driveshaft Installation Austin Healey 10
M BJ8 Inner Body Panel Repair Austin Healey 2
crispy BJ8 Front Suspension Austin Healey 9
HealeyRick BJ8 Repaint Advice Sought Austin Healey 15
BJ8Healeys Original Metallic Golden Beige BJ8 for sale Austin Healey Classifieds 0
M BJ8 Seat Thickness Austin Healey 6
D BJ8 Headlight Rims Austin Healey 0
B RHD BJ8 Throttle Control Rods Austin Healey 9
J BJ8 Radiator Fan Austin Healey 12
H BJ8 Heater Valve/Control Tap Austin Healey 3
R BJ8 Upholstery Austin Healey 5
M Mounting BJ8 Chassis on Rotisserie Austin Healey 8
T BJ8 Drain Channel Removal Austin Healey 2
B BJ8 Phase 1 Electrical Diagram Austin Healey 15
M For Sale BJ8 Tonneau Cover Austin Healey Classifieds 8
R Distributor: Reassembling BJ8 Engine Austin Healey 5
lbcspinners BJ8 chassis number ending with suffix "G" [??] on BaT Austin Healey 11
R New Engine mountings BJ8 Austin Healey 1
T BJ8 carpet Austin Healey 2
R Cylinder head gasket BJ8 Austin Healey 32
pkmh BJ8: Upper Trunnion Rebuild [Of Continuum] Austin Healey 9
BJ8Healeys For Sale 1965 BJ8 for sale Austin Healey Classifieds 0
M Getting behind the dash on BJ8 Austin Healey 4
J BJ8 flywheel take some pounds off Austin Healey 17
Keoke 1966 AH BJ8 on eBay Austin Healey 18
L BJ8 Batteries Austin Healey 8
pkmh Front Spring Removal For BJ8 Austin Healey 8
M Wanted Bj8 left front wing Austin Healey Classifieds 3
B BJ8 door hinges Austin Healey 7

Similar threads

Top