• The Roadster Factory Recovery Fund - Friends, as you may have heard, The Roadster Factory, a respected British Car Parts business in PA, suffered a total loss in a fire on Christmas Day. Read about it, discuss or ask questions >> HERE. The Triumph Register of America is sponsoring a fund raiser to help TRF get back on their feet. If you can help, vist >> their GoFundMe page.
  • Hey there Guest!
    If you enjoy BCF and find our forum a useful resource, if you appreciate not having ads pop up all over the place and you want to ensure we can stay online - Please consider supporting with an "optional" low-cost annual subscription.
    **Upgrade Now**
    (PS: Subscribers don't see this UGLY banner)
Tips
Tips

MGB Fuelpump 74 MGB

Mike W

Freshman Member
Offline
Im working on this barn find car new to forum and MGBs, anyway was checking fuel pressure@ 2.5 psi., with switch on, then did volume test, less then a quarter qt. I then checked the voltage to pump, and the voltage is pulsating 10v, and then nothing, like off and on every second, it also looks to be rewired because every one was talking about white wires to the pump where as mine are blue, is it suppose to pulse with key on and then when running speed up Im stumped on this, it will run and drive, but backfires and sputters in 4th gear, any help appreciated.
 

DrEntropy

Great Pumpkin
Platinum
Country flag
Offline
Just some thoughts: Fuel starved. Sounds like somewhere in its past it got a "creative" rewiring of the pump. It should have a steady 12V from the ignition switch. If the car does not have an overdrive transmission, you could find the yellow wire under-dash and have half of your rewiring of the pump solved. BMC (and later British Leyland) made all harnesses with the yellow overdrive wire, whether the overdrive was fitted or not.
 

Roger

Luke Skywalker
Bronze
Country flag
Offline
Does the MGB have a voltage stabiliser for gauges? Could the pump be wired from that, in error?
 
Similar threads
Thread starter Title Forum Replies Date
R SU Fuelpump Austin Healey 11
kennypinkerton Quick fuelpump fix MG 31
Simmo MGB Re Engined MGB MG 2
Carlbanan56 MGB MGB rear break rebuild MG 6
C Wanted Early MGB soft top and/or tonneaus, condition not very important MG Classifieds 0
Carlbanan56 MGB Mgb turn signals MG 17
J MGB 1970 MGB Steering Lubrication MG 1
C Wanted Wanted: 1977 to 1980 MGB Dashboard MG Classifieds 0
L SOLD!! For Sale MGB Hardtop MG Classifieds 3
EvansClassicCars For Sale 1980 MGB for sale MG Classifieds 0
J MGB Tire pressure for 1980 MGB MG 14
5 Wanted Wanted 1966 mgb banjo type axle rear hub MG Classifieds 0
I MGB Purchase of 1972 MGB Roadster MG 3
C MGB-GT MGB-GT Front Ride Height MG 0
J MGB Advice for new MGB owner? MG 16
D Wanted Wanted: Chicklet Headrests for MGB/C! MG Classifieds 0
Editor_Reid MGB Anders Clausager's "MGB" book MG 4
J MGB 1966 MGB won't start MG 1
Erica General MG Oil Drain Valve -- mine is an MGB, but they have others MG 3
TunaJ Will MGB Upper Seat Runners work with Midget seat rails? Spridgets 1
Erica MGB Carburetion and MGB fuel economy. MG 0
wkilleffer MGB MGB clutch slave bleed driving me nuts MG 38
R MGB side chrome installation MG 4
C MGB MGB MG 5
3798j Off Topic MGB at the Drive in Bank MG 1
wkilleffer MGB 1974 MGB clutch master cylinder questions MG 1
Rut MGB 62-67 upper MGB steering shaft MG 3
VeeCee MGB 1974 MGB Roof Installation MG 0
J MGB Just bought a 1966 MGB MG 50
T MGB MGB hoses MG 6
AngliaGT ANOTHER TR6,& an MGB Spotted 0
G MGB Sorry from the Newbie...Clutch gone on 78 MGB MG 17
Briancole702 MGB-GT 71 Mgb gt no gas in float bowls MG 1
Ranger68 Wanted 1969 MGB Sun Visor Wanted MG Classifieds 0
R MGB MGB Roadster Door Panel Speakers MG 9
DrEntropy MGB Good video on the MGB MG 0
adcronin For Sale MGB Turn Signal (lights, horn, indicator) Switch, New for 62-67, also Sprite MK 3 & 4, MIDGET MK 2-3 thru 67 MG Classifieds 0
J Wanted 1969 MGB Roadster sun visor clip MG Classifieds 4
JohnGone MGB 1980 MGB Spark Plug recommendations MG 6
R MGB 1972 MGB Defroster Hose MG 2
T For Sale MGB Black Label Overdrive For Sale Or Trade For New RB Parts MG Classifieds 2
T MGB-GT cant rails on 1967 MGB GT MG 12
JohnGone Wanted '80 MGB without seat belts? MG Classifieds 3
JohnGone MGB Help getting my 1980 MGB to pass CA smog test MG 19
JohnGone Wanted Spare & Jack for an '80 MGB MG Classifieds 0
B MGB 1977 MGB Battery Box and Shifter knob MG 4
D MGB MGB LE MG 5
P MGB 1974 MGB front spring length. MG 0
S MGB MGB Starter Woes MG 13
G MGB '71 MGB Front End Rebuild MG 2

Similar threads

Top