• 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 out of fuel at 1/4 full tank

NIB

Senior Member
Offline
Took my BJ8 home from the dealer a month ago, at the way i stopped to refuel, and filled it up with 12 gal.
Last weekend i ran out of fuel, easy to hear, since the fuelpump was pumping like crazy and it was very noisy. At the time the fuel gauge was at 1/4 full tank.
I was only able to fill in 10 gal of fuel before it was full, full is as i recall 14 gal.

It seems like the fuel gauge is showing correct then, but i am not able to use the last app 4 gal of fuel.
Anyone got an idea of why?

What octane number should i use?
If I use 95 RON, i believe thats 90-91 is USA, then the engine backfires when i stop. If I use 99 RON, 94-95 in USA, then there are no problems. Is that normal?

Niels
Denmark
 

Keoke

Great Pumpkin
Country flag
Offline
NIB said:
Took my BJ8 home from the dealer a month ago, at the way i stopped to refuel, and filled it up with 12 gal.
Last weekend i ran out of fuel, easy to hear, since the fuelpump was pumping like crazy and it was very noisy. At the time the fuel gauge was at 1/4 full tank.
I was only able to fill in 10 gal of fuel before it was full, full is as i recall 14 gal.

It seems like the fuel gauge is showing correct then, but i am not able to use the last app 4 gal of fuel.
Anyone got an idea of why?

Well basically it is a Healey. However if you make certain that the gauge never shows less than 1/2 tank you will not be left on the side of the road.

What octane number should i use?
If I use 95 RON, i believe thats 90-91 is USA, then the engine backfires when i stop. If I use 99 RON, 94-95 in USA, then there are no problems. Is that normal?

Any time a Healey backfires it is my experience that the engine is running lean. Either it is cold with inadequate choke or improper carburetor adjustment. other than that all your experiences seem normal.---Fwiw--Keoke- :laugh:

Niels
Denmark
 
Offline
nib, my fuel guage did the exact thing showed 1/4 tank but was emty, i can hear it all now.."you spoze to use capacitors, resistors, ohm meter, volt meter, coils, lightning rods, power supply, scopes, special color wiring" etc. etc. all i did was put exactly 7 gals of fuel in the tank turned the ignition on and with the guage in hand adjusted it to read 1/2 tank, its been nuts on ever since. *mileage and results may vary, i can feel the rumbling ! :smirk:
 
Country flag
Offline
NIB said:
Took my BJ8 home from the dealer a month ago, at the way i stopped to refuel, and filled it up with 12 gal.
Last weekend i ran out of fuel, easy to hear, since the fuelpump was pumping like crazy and it was very noisy. At the time the fuel gauge was at 1/4 full tank.
I was only able to fill in 10 gal of fuel before it was full, full is as i recall 14 gal.

It seems like the fuel gauge is showing correct then, but i am not able to use the last app 4 gal of fuel.
Anyone got an idea of why?

What octane number should i use?
If I use 95 RON, i believe thats 90-91 is USA, then the engine backfires when i stop. If I use 99 RON, 94-95 in USA, then there are no problems. Is that normal?

Niels
Denmark

The only thing I can think of is there is something amiss with the fuel pickup tube. If there's a hole in the tube at about the 4g level--or, possibly, the tube is cut/broken off--the pump would suck air instead of fuel, causing the symptoms you describe.

I think--the dyno experts may correct me--that a stock BJ8 at 9.1:1 compression should run fine on 91 octane ((R+N)/2, 95 RON). If the compression is any higher--without additional cam overlap--higher octane may be required. If, by 'backfire' you mean run-on (or 'dieseling') then check timing and idle speed.
 
Country flag
Offline
To determine whether it is the sender or a hole in the pickup as Bob suggests simply use a dipstick to see what the fuel level actually is when the fuel pumps stops supplying gas to the engine and take it from there.
 
Similar threads
Thread starter Title Forum Replies Date
Cutrog1 BJ8 Fuel Tube Installation Austin Healey 10
S BJ8 Fuel Pump Austin Healey 13
B Fuel pipe runs BJ8 Austin Healey 2
Lutz Kramer Fuel gauge and sender unit for 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
T BJ8 Tachometer and Fuel gauge stopped working. Austin Healey 27
S BJ8 Fuel Gauge -Shows 1/4 tank when empty Austin Healey 10
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
G BJ8 Fuel Gauge Core Austin Healey 9
Frank C. BJ8 Fuel Gauge Austin Healey 5
F BJ8 Fuel Filter Installation Austin Healey 14
L BJ8 FUEL TANK SPOTTED Austin Healey 2
G BJ8 Fuel gauge help Austin Healey 8
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 6
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