Rover V8 lumpy running, low fuel pressure?

[sweatyfox]

Hi all,

I’ve been having some running issues with my car with either fueling or ignition.

When started the other days it was lumpy and missing. Decided to go for a drive and it was still missing a few minutes later I had total loss of power and engine cut.

I tried to start it and nothing at all, didn’t even try to fire.

After about 20 minutes it fired up and I was able to get back home but still running lumpy.

Have since been out for another drive, again running lumpy and at one point was total power loss and then kicked back in with a jolt.

It seems to be running ok at tickover but haven’t been back out since.

The car setup is a Rover 3.5 V8, running Twin 1.75” SU carbs, low pressure Facet fuel pump. Has always run fine until this week.

I have tested the fuel pump and output pressure was 6psi.
The fuel regulator output pressure tested at 0psi. Nothing showed up on the gauge, but when you put the pipe into a bucket fuel flows pretty well, just no significant pressure.

Is this likely to cause problems?

Or should twin 1.75” SU carbs definitely have a positive fuel pressure of around 3psi?

Thanks in Advance,

Sweatyfox

[sweatyfox]

Thanks for your replies.

The car doesn’t have an ignition amplifier (its Installed in a kit car) so just down to the basics, dizzy, coil and ballast resistor.

Do you think that no measurable fuel pressure from the regulator could be causing the problem?

Do SU carbs work best under pressure?

Thanks.