Club126UK

Fiat 126 Chat => Tuning & Customising 126 Models => Topic started by: Rifart on April 26, 2021, 10:24:21 AM

Title: Submerged Fuel Pump Inside Tank (BIS)
Post by: Rifart on April 26, 2021, 10:24:21 AM

Hi gents,

Converted the 126 BIS engine to EFI by using single point injection from Fiat UNO. Fuel delivery is done by an external pump which could only be located to the engine bay instead of low-level of tank. As a result, car runs fine but system suck air if the car stays for long time and creates difficulty on first starts...

Does anyone have an opinion or a solution for placing a pump inside the tank without ruining fuel gauge ?


(https://i.postimg.cc/vgVyVnp7/176389128-800761214206092-5286039152652992759-n.jpg) (https://postimg.cc/vgVyVnp7)

(https://i.postimg.cc/GTnCJ2CW/177727868-284836679803155-3962871015170701927-n.jpg) (https://postimg.cc/GTnCJ2CW)

Title: Re: Submerged Fuel Pump Inside Tank (BIS)
Post by: Abarth982 on April 26, 2021, 11:57:32 AM

In the early fuel injection systems there used to be a fuel Accumulator in the fuel line after the pump.  This was a like a temporary fuel reservoir (Marmite jar size) and it held the fuel at pressure to ease starting etc.  Not sure if this would help your problem but maybe worth investigating ...

Title: Re: Submerged Fuel Pump Inside Tank (BIS)
Post by: andyzeetec on April 26, 2021, 12:46:42 PM

Blimey that's a very nice clean engine you have there  :o :good:

sorry I cant answer your question.

Title: Re: Submerged Fuel Pump Inside Tank (BIS)
Post by: Pete126 on April 27, 2021, 12:14:43 PM

Have you tried a petrol non-return valve in front of the pump there's loads on eBay

Title: Re: Submerged Fuel Pump Inside Tank (BIS)
Post by: Rifart on April 28, 2021, 07:35:15 AM

Hey bud, would you please share a link of those ?

Title: Re: Submerged Fuel Pump Inside Tank (BIS)
Post by: Rifart on April 28, 2021, 08:24:56 AM

Quote from: andyzeetec on April 26, 2021, 12:46:42 PM

Blimey that's a very nice clean engine you have there  :o :good:

sorry I cant answer your question.

Thanks bud, well engine as well as the rest of car had a comprehensive restoration...

Title: Re: Submerged Fuel Pump Inside Tank (BIS)
Post by: Pete126 on April 28, 2021, 10:56:44 AM

Not sure of the bore size 6mm or 8mm so you'll have to measure

https://www.ebay.co.uk/itm/303930592010