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Fuel pressure from unknown GP pump?
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Brewster



Joined: 02 Sep 2022
Posts: 28
PostPosted: Thu May 02, 2024 5:08 pm    Post subject: Fuel pressure from unknown GP pump? Reply with quote
I?ve got a serious over-fuelling problem with my Mk2 Humber Sceptre. The Weber 28/36 carb has been ultrasonically cleaned and seems to be fine. I?m now looking at the fuel pump, an Italian made GP unit, to see if that?s the problem. I?m waiting for a fuel pressure gauge to be delivered in a couple of days but would anyone know if that carb is suitable for the car or what pressure it puts out? There seems to be very little info on it on the web.

Bruce
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peter scott



Joined: 18 Dec 2007
Posts: 7215
Location: Edinburgh
PostPosted: Sun Jun 30, 2024 4:15 pm    Post subject: Reply with quote
On SU electric fuel pumps the thing that determines the pressure is the diaphragm spring.

Peter
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Rick
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Joined: 27 Apr 2005
Posts: 22788
Location: UK
PostPosted: Mon Jul 01, 2024 2:37 pm    Post subject: Re: Fuel pressure from unknown GP pump? Reply with quote
Brewster wrote:
I?ve got a serious over-fuelling problem with my Mk2 Humber Sceptre. The Weber 28/36 carb has been ultrasonically cleaned and seems to be fine. I?m now looking at the fuel pump, an Italian made GP unit, to see if that?s the problem. I?m waiting for a fuel pressure gauge to be delivered in a couple of days but would anyone know if that carb is suitable for the car or what pressure it puts out? There seems to be very little info on it on the web.

Bruce


What are the symptoms? It's not just a leaky float causing it to flood I assume, or a needle valve not fully closing?

RJ
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