fuel pump regulator/ relay

[Penelope Stopit]

Pulling the Pektron should stop it

[KKson]

I pulled the pektron and every other relay on the board and the pump just keeps running.......

[Penelope Stopit]

Man made fault then ?

Good one to find

[KKson]

I'll see if there's actually a fuse associated with the pump next. At least I will then know where the wiring starts from. If I can't easily trace the wiring and re-install as original then I'm thinking of installing an inertia switch in the wiring for safety sake.

[Penelope Stopit]

KKson said:

I'll see if there's actually a fuse associated with the pump next. At least I will then know where the wiring starts from. If I can't easily trace the wiring and re-install as original then I'm thinking of installing an inertia switch in the wiring for safety sake.

Inadvertently highlighted what could be a big problem

There should be an inertia switch wired into every wedge flapper type fuel system circuit

[KKson]

Penelope Stopit said:

Inadvertently highlighted what could be a big problem

There should be an inertia switch wired into every wedge flapper type fuel system circuit

I'm on to my third EFi Wedge, and every one has had the two spade connections for an inertia switch sat there at the back of the engine, next to the bulk head but I have never seen an inertia switch on a Wedge, and I've certainly looked in many engine bays over the years. I thought the Rover had them installed but TVR didn't install them? I think there was a handful that had them as an option.

[KKson]

So I can see how it should be wired. I'm guessing both relays have somehow been bypassed but as the other items linked to the circuits work, the wiring must still be in there somewhere.... Guess it's multimeter time.

[Penelope Stopit]

KKson said:

Penelope Stopit said:

Inadvertently highlighted what could be a big problem

There should be an inertia switch wired into every wedge flapper type fuel system circuit

I'm on to my third EFi Wedge, and every one has had the two spade connections for an inertia switch sat there at the back of the engine, next to the bulk head but I have never seen an inertia switch on a Wedge, and I've certainly looked in many engine bays over the years. I thought the Rover had them installed but TVR didn't install them? I think there was a handful that had them as an option.

Doubt cost would have been a deciding factor

It's a strange one

KKson said:

So I can see how it should be wired. I'm guessing both relays have somehow been bypassed but as the other items linked to the circuits work, the wiring must still be in there somewhere.... Guess it's multimeter time.

Could be something as simple as an ignition supply connected to fuse 7 supply cable at fuse or fuel pump relay loom, even an incorrectly wired fusebox or wrongly built loom

Possibly a problem in the past with the AFM contacts and someone carried out a quick fix

Have fun

[adam quantrill]

Just theorising but maybe the deciding factor is that the wedge can brake from 60-0 on warm tyres in about 15m, thus approaching -1.2g.

Compare with the SD1 which could probably do about -0.7g tops, I expect the standard inertia switch would be tripped every time us wedge drivers approached a roundabout, on full anchors, outbraking the hoi polloi, with embarrassing results.

So it was never fitted in production cars (although I have heard of a couple).

[SLB]

KKson said:

Had a look at the SEAC this afternoon as its fuel pump runs all the time also. Disconnected the AFM and it still ran. Changed the fuel relay for a good one I had in my 350i and pump still runs all the time, so further investigation is needed.

My SEAC was the same by the sound of it. As soon you started cranking the fuel pump kept running. It was a pain when cold and it could stall when I was closing the garage door. The engine would flood and I'd have to whip the plugs out quick to dry them off.

[KKson]

adam quantrill said:

Just theorising but maybe the deciding factor is that the wedge can brake from 60-0 on warm tyres in about 15m, thus approaching -1.2g.

Compare with the SD1 which could probably do about -0.7g tops, I expect the standard inertia switch would be tripped every time us wedge drivers approached a roundabout, on full anchors, outbraking the hoi polloi, with embarrassing results.

So it was never fitted in production cars (although I have heard of a couple).

I had an inertia switch on my TR6. Worked fine until you hit a big pot hole and then you had no engine... I hate to think how often it would pop on todays utterly ste roads.

[adam quantrill]

Ha ha that too - hard suspension!

[Penelope Stopit]

adam quantrill said:

Just theorising but maybe the deciding factor is that the wedge can brake from 60-0 on warm tyres in about 15m, thus approaching -1.2g.

Compare with the SD1 which could probably do about -0.7g tops, I expect the standard inertia switch would be tripped every time us wedge drivers approached a roundabout, on full anchors, outbraking the hoi polloi, with embarrassing results.

So it was never fitted in production cars (although I have heard of a couple).

There's a big difference between impact and g force

[tvrmk363]

KKson, Thanks.

[KKson]

tvrmk363 said:

KKson, Thanks.

no problem but for what? I'm not an electrical expert. I am however many moons ago a qualified mechanical engineer. I just measured electrically what I see on my Wedges. I love the cars and try to help where I can, but I'm slightly confused by some of the conflicting "expert" knowledge in this thread. Anyway, mine both work, apart from a few mechanical gremlins. Dodgy clutch on my 390SE and buggered synchro on the SEAC. Keeps me busy down in my garage.