Anyone on the list.... Help, Please.
I am struggleing with this same problem and am totally convinced
that it is the Fuel Pump. What tricked me was that when it quit
I would slam the door and it would fill the bowl while I was opening
the hood. When I started being more gentle I found that the bowls
were empty and the pump wouldn't work untill it was bumped. I
ran it with the pump cover off and found that when the car stumbled
and died I could go back to the trunk and lightly touch the toggle and
it will suddenly pump like mad.
I have tried the following things so far:
1. Clean points - didn't work
2. Lube Toggle Mechanism - didin't work
3. Rotated the toggle mechanism one turn
clockwise on the diaphram shaft. - not sure yet....
None of these quite seem to help yet.
I suspect the follwing possibilities
1. Too stiff a diaphram
2. Incorrect gap from the toggle to the backing plate
The pump is less than 2 years old and has had this problem
almost since new. It was better when the engine realy ran
bad. I think that was because it shook the car so much. Now
that it is running like silk, it is worse. Maybe because it doesn't
vibrate the pump as much. Realy frustrating to track down
because it was so intermitant untill recently when I was able
to get the motor running so much better. (new head)
http://www.mgbexperience.com/service/tips/fuel.html
has some interesting articles about half way down the page.
They are answers to questions by Chris Reichle and Rick Morrison.
Scott Allen wrote:
> Hi,
>
> Ran into a problem with the BGT today, ('74 1/2) and hopefully someone on
> the list has had a similar experience and can point me in the correct
> direction.
>
> Here's the scenario(s): car's warm, choke is all the way in. I go and fire
> her up and run her at low speed in the neighborhood to do some errands.
> After some five minutes, the car stumbles, loses power, backfires a bit and
> dies. I fire her up again and she starts but the rpms get to 1500 or so and
> she dies again. I hop out, and disconnect the fuel line to see if I have
> fuel when the ignition is on, (I do) I then pull the dizzy cap to check the
> cap and rotor, (had a rotor go out on me once) and they're fine. I then
> pull the battery cover and check the charge on the battery, (in case the alt
> went bad) and I've got 12.8 volts.
>
> I then hop in the car and try and start her and after stumbling a bit the
> rpms go to 3k or so, and she's off...
>
> So I'm scratching me head, and decide to take her out on the main drag near
> the house to get her above 55mph, and once again after five minutes or so
> she starts losing power, stumbles and backfires like she's going to die. I
> pull off but she never quite dies, and I put the accelerator to the floor.
> Sure enough, she stumbles a bit, coughs, and then the rpms go to 3k or so
> and we're off again.
>
> I get home without incident.
>
> So I'm wondering were to start. I'm going to check the points and condenser
> on the morrow regardless, but like I said I'm wondering if this has happened
> to anyone else.
>
> Oh yeah, I replaced the coil 7k ago.
>
> Thanks in advance,
>
> Scott Allen
> 74 1/2 BGT
> 52 TD
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