fuel problem

[Shitbox]

Was wondering how to tell whether I have a fuel pressure regulator failure or fuel pump failure.
so I have a 71 with a 4ag twin 45 carbed and run a speco fuel pressure reg and a facet electric fuel pump. I went out tonight and drove the car pretty hard then it started to die i was pushing the accelerator and nothing would happen loss of power and just sounded like the carbs were sucking a fuck load of air. I checked the fuel reg gauge and showed 0.5psi i left the car sitting for a bit and then it was ok for a while but the pressure never rose back to where it should be 4 - 5 psi.

So pretty much want to know whether people reckon its the fuel pump or regulator cheers.

[Dylan]

Whats the specs on your Facet fuel pump, as far as I know they are self regulating. Also how is it wired up?

[Shitbox]

not sure on the specs of it as it came with the engine i bought but yeah i have an adjustale regulator after the fuel pump.
also today i checked the fuel pressure and everytime i accelarated it would drop to one. I let it warm up and drove round for abit it seemed fine and the pressure went to about 3ish psi but had my regulator set to 5 as i revved it it just stayed on 3psi. So im not really sure what the problem is.

[Javal]

My money says the facet pump has eaten a dick / is getting too hot. Is it engine bay mounted?

I had a case a few years back where a friend of mines car would cut out / severely lose power after a thrashing as the facet pump would get too hot and cut out, however under normal driving conditions there were no problems.

[Shitbox]

yeah sounds right think it haqs eaten to much dick it just happens after a thrashing its in the engine bay it never used to do it though. but also my fuel pressure still doesent sit where i want it at 4 or 5 psi should i change the pump.

[Javal]

You can try relocating it to a cooler location, like under the car near the fuel tank or in the boot.

Alternatively you can use a low pressure rotary / vane fuel pump (again, mount it somewhere other than the engine bay) such as one available from holley. A rotary / vane pump is much more reliable than a facet pump.

[Shitbox]

Is this the one your talking about
would I be able to run it without a fule pressure reg since it flows at 4psi?

[Javal]

flow does not equal pressure.

[Javal]

Double post.

[Shitbox]

yeah i might grab it and still run the reg then