Fuel Pump or Inertia Switch ???

[philt]

Hello all.
Nice day yesterday so off to the seaside. All well and tickety boo for first 40 miles, until a cough splutter and she (1972 mk1) dies.
Up with the boot and a quick tap on the fuel pump and it spits into life and it fires up. Sorted ?
No.
Next 10 miles went without incident but in the final 10 miles it repeatedly keeps cutting out, and especially going up hills, and at an ever increasing frequency. To the point that it wasn't a sensible option to proceed and so a trip home on the back of a low loader.
Always once you tapped the pump it would spring into life just clearly didn't want to keep going.

Fuel pump was changed 7 years ago.

Having read elsewhere on the forum I initially thought that points need cleaning, but the presence of that ball moving about in the inertia switch, especially the problems when going up hill, which I'd never even considered what was in that thing that until reading here, is that likely?

Any advice appreciated.

Phil

[Tdm]

Temporarily bypass the Inertia switch to see if the problem remains or goes away.
If the problem persists it is the pump not the Inertia switch.
OnlY takes a few seconds to bypass the Inertia switch - pull the wires off, then join them together (making sure they don't short on anything).

[malc4d]

Might be the fuel intake is higher than the fuel in the tank when the car faces up hill. Mine did this once when l parked uphill. 5 Gal jerry can later and the car started fine. Don't forget that the intake is in the front of the tank

[MandM]

Check the filter, tank may need a clean out?

You can also put a meter across the inertia switch and check the resistance should be close to zero

[philt]

Thanks for comments.

[Stagdad]

You can do what Tdm has suggested by using a modern blade fuse the connectors will fit straight on.