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 Post subject: Purpose of in-tank fuel pump in 7xx series
PostPosted: Mon Sep 03, 2018 10:35 am 
Canadian Tire Bolt ons

Joined: Wed Jun 07, 2017 6:59 pm
Posts: 49
Location: waterloo, ontario
What is the purpose of the in tank fuel pump?

It is specific to the cars with IRS due to the layout of the tank(s)?


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 Post subject: Re: Purpose of in-tank fuel pump in 7xx series
PostPosted: Mon Sep 03, 2018 9:11 pm 
Haha, I just built a W24 Octo-Turbo, now what?!
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Joined: Wed Jun 14, 2006 4:19 pm
Posts: 2995
Location: Lethbridge, AB
It feeds fuel to the main pump. No other way to get fuel out of the tank. Not sure about the IRS question - but I doubt it.

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 Post subject: Re: Purpose of in-tank fuel pump in 7xx series
PostPosted: Tue Sep 04, 2018 9:30 am 
Haha, I just built a W24 Octo-Turbo, now what?!
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Joined: Wed Dec 21, 2005 8:40 pm
Posts: 3379
Location: Calgary, Ab
The IRS has a saddle tank, but there's still only one in-tank pump and it's not to get fuel out of the far side of the tank. As Craig said, the main pump cannot "pull" fuel - it must be fed fuel from the in-tank pump. Generally the failure mode shows up as the car running fine until about half a tank, then a noisy main pump, then bucking around corners, then dead stalling. Add more fuel and it runs again.


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 Post subject: Re: Purpose of in-tank fuel pump in 7xx series
PostPosted: Tue Sep 04, 2018 10:43 am 
Canadian Tire Bolt ons

Joined: Wed Jun 07, 2017 6:59 pm
Posts: 49
Location: waterloo, ontario
What is the common fix for the in tank fuel pump?
Replacement, broken hose, leaky hose?


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 Post subject: Re: Purpose of in-tank fuel pump in 7xx series
PostPosted: Tue Sep 04, 2018 12:13 pm 
Haha, I just built a W24 Octo-Turbo, now what?!
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Joined: Wed Dec 21, 2005 8:40 pm
Posts: 3379
Location: Calgary, Ab
All of the above. I've seen all three.


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