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isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

What is the pressure from the external fuel pump to the fuel filter?
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Paul · Posted: Thu Jun 24, 2010 12:22 pm Post subject:

It's controlled by the fuel pressure regulator in the fuel dizzy (about 90 psi). The pump is capable of higher pressures.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

So, I'd have to use at least 100psi fuel injection hose?
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

Paul · Posted: Thu Jun 24, 2010 1:16 pm Post subject:

That should work.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

The external pumps are constant and rated 4.5 to 6.5 bar so a 100 psi line would be marginal and not very long lived.

Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

isuras2 · Joined: 17 Jun 2005 Posts: 458 Location: Phoenix, AZ

The hose I was thinking of has 180psi working pressure. I would also try to minimize the amount of hose I'd use.
_________________
Rob
'80 931 (sold)
'80 924 NA (sold)
Former Omaha Crew

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

180 psi is much better. I tried a 150 psi on my 928 euro and it didn't last long. I think the pulsing of the pump got to it.

Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black