Has anyone looked into fuel pump pressure for later 356/912s?
My books and people on registry say different things.
My car feels like it has fuel starvation with pump set to 3psi.
fuel pump pressure for later cars?
-
Ren
- DDK forever
- Posts: 735
- Joined: Wed Sep 01, 2004 9:32 am
- Location: Southampton
fuel pump pressure for later cars?
Avoiding local so-called self proclaimed specialists.
-
Dakota
- DDK forever
- Posts: 586
- Joined: Thu Oct 25, 2007 10:46 pm
- Location: SE London under a rusty car
Hi Ren
I would have thought three is fine as two and a half is kind of normal , but in the past I have had issues with siting the pump , some pumps are happier pushing rather than pulling so to speak and if supplied the instructions should be followed and normally the pump must not be higher than the carbs , my 356 has a facet silver top down by the gearbox and a Malpassi filter king on the bulkhead and sometimes that felt like it was starving out and it runs Solex carbs on a nine one two motor, Bill.
I would have thought three is fine as two and a half is kind of normal , but in the past I have had issues with siting the pump , some pumps are happier pushing rather than pulling so to speak and if supplied the instructions should be followed and normally the pump must not be higher than the carbs , my 356 has a facet silver top down by the gearbox and a Malpassi filter king on the bulkhead and sometimes that felt like it was starving out and it runs Solex carbs on a nine one two motor, Bill.
I am a person of simple pleasures so if you don't have any simple pleasures to offer me, beer, pizza or Porsche bits etc kindly leave me be, XX.
-
Mike Smith
- DDK rules my life!
- Posts: 1243
- Joined: Wed Apr 06, 2005 12:37 am
- Location: Billericay, Essex
- Contact:
Pumps
Bill,
You are correct - ALL pumps should push
Keep the suction length to a mininum - it is a basic principal in pumpimg whatever the medium or application
It does help considerably in our cars that we have a flooded suction
You are correct - ALL pumps should push
Keep the suction length to a mininum - it is a basic principal in pumpimg whatever the medium or application
It does help considerably in our cars that we have a flooded suction
Mike at P.R.S.
www.prs356.com
www.prs356.com
-
Ren
- DDK forever
- Posts: 735
- Joined: Wed Sep 01, 2004 9:32 am
- Location: Southampton
fuel pump ressure
I found the problem it was a blocked idle jet that looks to be the wrong size.
I set pressure to 3.3psi as my books say between 3 -3.5psi.
I set pressure to 3.3psi as my books say between 3 -3.5psi.
Avoiding local so-called self proclaimed specialists.

