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GP fuel pumps?
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Brewster



Joined: 02 Sep 2022
Posts: 26
PostPosted: Thu May 02, 2024 6:51 pm    Post subject: GP fuel pumps? Reply with quote
I have a serious over-fuelling problem with the Mk2 Humber Sceptre. The Weber 28/36 carb was ultrasonically cleaned and everything seems OK there. But I know nothing about the GP Made in Italy fuel pump apart from it not being original.

I'll be getting a fuel pressure gauge in a couple of days to see what it's up to but does anyone know anything about these carbs? Are they suitable for the Weber-equipped 1725cc? Any idea what sort of pressure they deliver? I've had a good look but there's precious little information about them out there.

Bruce
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bjacko



Joined: 28 Oct 2013
Posts: 364
Location: Melbourne Australia
PostPosted: Fri May 03, 2024 5:58 am    Post subject: GP pumps Reply with quote
If you Google "GP Italian Fuel Pumps" you may find your answers.
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alastairq



Joined: 14 Oct 2016
Posts: 1956
Location: East Yorkshire
PostPosted: Fri May 03, 2024 9:58 am    Post subject: Re: GP fuel pumps? Reply with quote
Brewster wrote:
I have a serious over-fuelling problem with the Mk2 Humber Sceptre. The Weber 28/36 carb was ultrasonically cleaned and everything seems OK there. But I know nothing about the GP Made in Italy fuel pump apart from it not being original.

I'll be getting a fuel pressure gauge in a couple of days to see what it's up to but does anyone know anything about these carbs? Are they suitable for the Weber-equipped 1725cc? Any idea what sort of pressure they deliver? I've had a good look but there's precious little information about them out there.

Bruce


Is your pump an electric pump? Or a mechanical pump attached to the engine block?

A lot of electric pumps are made in Italy'...Indeed, for me, the most famous fuel filters and regulators are made by Malpassi...[Filter King].

Weber carbs, in my limited experience, are sensitive to fuel pressure from the pump.
[As indeed are SU carbs].

Fuel pressure needs to be no more than two or three PSIs....
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Brewster



Joined: 02 Sep 2022
Posts: 26
PostPosted: Fri May 03, 2024 3:05 pm    Post subject: Reply with quote
It?s a mechanical pump which, as I?ve just found out having put the gauge to it, is squirting out at 4psi which shouldn?t be enough to cause the sort of problems I?ve having as far as I know.

I?ve warned that bloody Humber that if it doesn?t start behaving I?m going to go full Basil Fawlty on it.
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