fuel problems - any ideas

[cluxford]

On Fri I was out n about and the fuel pump died....tilt trayed home

Couldn't work on it till today....I'm in Australia so it's now Wed

OK, so started this morning with sparky.

Blown fuse, pop in a new one, fires up perfectly, then 1 min later...dead...no fuel pump. Fuse gone...replace, but wire across the fuse to circumvent it blowing

Drawing right amps...pump still not working

Pump primes for split second then starts "clicking"

We suspect it's the pump. So I call Aeromotive. They suspect pump screwed. I call VPW they have one, so I order it and have it delivered today. Aeromotive say they will fix and replace if I pay shipping.

So new pump arrives 2pm.

I get under rip out the old one (not easy, have to pull battery and few other things). Pull the pre pump filter, clean it, had some crap in it but very very small metal "specs" but not a lot.

Draining the full tank was the longest part.

Put it all back together with the new pump, put the fuel back in...

Fire it up.

Starts, runs 1 min...fuel pump stops again (this time brand new pump).

Now pump will prime for like 1 sec then "lock up" - doesn't click like the old one, but you can hear it ain't turning, it's trying but can't

so next step is we pull the inlet off the regulator so see if fuel getting to the reg...yep for the 1 sec it primes it pumps fuel to the reg inlet, as soon as it "locks up" no more fuel

So get the sparky back, we "hot wire" the pump to 12v jump pack. just locks straight up...no priming. We pull the old one out of the box, connect it to the jump pack, spins like crazy and works perfectly...this was the pump that was "clicking".

So now what is going on ?

Here is the system:

-10 out of tank
into 100 micron filter
into pump (all -10 lines) (Aeromotive A1000)
out of pump into 70 micron filter
into reg
reg splits to carb and a return line (-10) to tank
Tank is vented

Tank was full when this happened (filled up 5 mins earlier)

Tomorrow I plan to pull the outlet out of the pump that goes to the second filter and see if I disconnect it from the second filter it pumps into a bucket.

Struggling....not sure what's going on. It ain't electrical and there appears to be no blockage (given it pumps fuel when the pump spins), no vapour lock...just weird

68 Camaro
632 BBC (World Crate Merlin III)
Dominator 1050 Carby

Any ideas anyone ?