Tom Medeen's Journal

Home Page: Tom Medeen
Tacoma, WA, USA

Total Posts: 1

Fuel Starvation

Tom Medeen — Posted on The MG Experience
Friday April 12, 2019 7:19 PM

'72 MGB-GT with '67 1800 motor. Car runs for ten to twenty minutes just fine. Fuel starvation begins and she quits. Wait five minutes and start, then she'll run for another round. Have replaced fuel lines and fuel pump, filter and blown out lines to and from emissions canister. Have fun car with fuel tank cap removed. Drained tank and visually inspected fuel pickup...all good, new tank. When motor running, carbs operate properly. Have poured two bottles of fuel cleaner and run through five gallons of fuel. What's the cause...I'm stumped!

IMG 20181107 122615

Member Comments on Journal Entry: Fuel Starvation ↵

2019-04-13 08:19:45 # 56030

Comment by Michael Lippmann

Not sure but did you say it runs fine with fuel cap removed? If so you have a blockage in the venting somewhere and eventually the fuel pump cannot overcome the lack of venting. Drill a hole in the filler cap...You might get more repsonses if you post this on the MGB Forum where more people view?Thanks and good luckMike

2019-04-13 09:22:18 # 56031

Comment by Tom Medeen

So, if I disconnect the venting completely and use an early"B" gas cap, plus plug the vent connection on the top of the tank by the filler neck...I'm good to go?

2019-04-13 20:56:19 # 56042

Comment by Michael Lippmann

Hi TomIt will only help if somewhere your existing venting is plugged...Good luckMike

2019-04-13 22:09:12 # 56045

Comment by Tom Medeen

Thanks Mike, I will give it a try.

2019-04-17 07:28:57 # 56203

Comment by Keith Evans

Hi,What type of Rotor arm have you got, the So called new Lucas ones have too much Carbon in them and can ARC to Ground. I was Stumped with a similar issue until I put a RED Rotor arm on, never has faltered since.Just an idea.Good LuckKeith

2019-04-17 08:34:03 # 56205

Comment by Tom Medeen

Thanks Keith, I got "Mr B" back on the road. Totally eliminated the evaporative/vent system and converted to early gas cap plus a neck. Drilled 1/4 inch hole through interior and outer chrome of a lock gas cap. All is right with the world!

2019-04-17 10:52:07 # 56213

Comment by Keith Evans

Well done, Glad you sorted the problem.ATBKeith

2019-04-27 17:54:51 # 56550

Comment by John Gott

Have you checked the fuel pressure just before it passes into the first carburetor (place a tee in he line and measure)? I think it should be no more than 3lbs (ish). Maybe your slowly flooding it due to much pressure or have a bad seat in the float control valve(s).To quote Arthur Conan Doyle "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."

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