11 replies to this topic

[tamlamotown123]

Hi anyone had this problem, driving on level roads at any speed  no problem, however when driving up a long uphill road after a couple of hundred yards engine power goes  well down and will not rev, have checked floats in both carbs and they were not sticking Have 20/50 oil in dashpots  . (2 x 1 1/4 SUs) thanks Phil

Compression test 165,170,170,180

Edited by tamlamotown123, 11 August 2021 - 08:14 AM.

[Spider]

Have you got a Fuel Filter on the Inlet side of the pump ?

[slidehammer]

I had this same problem on my wife's MG Metro in the 90's and it turned out to be the mechanical fuel pump (on the back of the block) must have been starving the engine of fuel under constant load. Took me ages to find the source of the problem

[tamlamotown123]

hi thanks yes I have a glass line filter just before the carbs, it looks very clean

[tamlamotown123]

Hi I have fitted an electric pump which you can hear working to fill the bowls on start up

[timmy850]

Next time the issue happens, shut off the car and coast to a stop (if it's safe to do so) while the pump is off

Take off the fuel bowl lids and check the level in the bowls

[ThermalEvent]

Just a thought but have you tried removing the fuel tank cap and then driving up a long hill? I could be way off the mark but it might be a partial vaccume in the fuel tank causing starvation?

Edited by ThermalEvent, 13 August 2021 - 11:15 AM.

[tamlamotown123]

Hi, after check the float valves again and found no problems I refitted and went for a test run, traveled about 3/4 mile when engine power and revs went seriously down.  Shut down engine for 5 mins then switched ignition on, pump immediately started up filling the carbs.

managed to get it home with another stop as before.When home took lids off the bowls, one bowl full; the other as dry as a cork.

Decided to buy new float valves hope it resolves the problem, it just shows a visual inspection does not always find the fault   

[nicklouse]

Just a thought but have you tried removing the fuel tank cap and then driving up a long hill? I could be way off the mark but it might be a partial vaccume in the fuel tank causing starvation?

As most Minis have a tank vent if this fixes it you have a closed/blocked tank vert. Or you have the wrong cap.

[sonscar]

On minis I have had over the years the tank vented into the boot as the rubber pipe had rotted away,out of sight out of mind,Steve..

[timmy850]

So did it work properly before, or has the issue only just started happening?

If there are more than one fuel hose connection per fuel lid, are they all connected correctly?

[tamlamotown123]

Hi this problem has just arisen but good point about the breather pipe in the boot will check it out that its not crushed or kinked