Is a red Top OK?

[tetlow]

Linked to my previous fuel pressure problems, I have fitted a Red Top Facet pump with a pressure regulator on a bog std 3.5 with a Webber 500 carb.
I seem to be having pressure fluction problems.
Can I run without the regulator?
The spec on the pump is max 7psi. Would this cause problems on tick over?
Regards
Dave

[ian.stewart]

I would reccomend allways run a regulator, 7psi, I would think you will be getting into float lifting territory, What regulator are you using, ??

[katanaman]

on the webber 7psi is a problem you need to be down to 4.5-5 psi

[JP.]

I am running a Facet Red Top for several years now with no problems at all since I fitted a kingfilter with a fuelpressure gauge.

Just buy yourself a Kingfilter (Rallydesign) and a fuelpressuregauge. Remove the brass plug on the outletside of the Kingfilter and screw the gauge in.
Set fuel pressure with the big nut on the midlle of the Kingfilter at around 5 Psi.

[tetlow]

That is my problem. I have a Filter King fitted and adjusted it to 5 psi but the pressure is not stable.
The adjustment is not linear. It seems I could have a pump problem but the pump is new and is the second one I have tried.
I recently tried a Mallory pump. The pressure was much better than the Facet and I could adjust it better but it was too noisey, even completely boxed in and on rubber mounts.

[CJV8]

Could there be a partial blockage somewhere?
Have you checked the filter(s)?

[tetlow]

I have checked both filters and found no problems but I have noticed the plastic filter on the pump inlet, has only has about 5 - 10 mm of fuel in it. It is orientated about 45deg down to the pump which is fitted about 100 mm below the level of the bottom of the tank.
I have removed the fuel cap to check if the tank is not pressurising and it is OK.
Is this amount of fuel in the filter normal?
Dave

[katanaman]

filter will only fill as far as the outlet on it so if the fuel is covering then then its ok.

[tetlow]

Ta