Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered
 
Join Date: Jul 2007
Location: Fort Worth
Posts: 112
Garage
No Start - Fuel Related

I had the car out running around about 3 weeks ago, then went to start today and nothing. Any help diagnosing is appreciated.

The Car:
1970 911t
2.2 with Webers
Fuel Pump located just outside the tank.
New Fuel Filter in the engine bay.


I pulled all the plugs to check for spark and clean them. I have an inline guage just downstream of the fuel filter, before the fuel lines split going to each carb. The pressure is steady at 3 psi, regardless of throttle position.

I put fuel in the horns to verify the car will run and it worked.

Assuming the fuel pressure is acceptable, it seems the issue must be in the short line runs between the fuel pressure guage and the carbs. Also, part of that run is rigid line.

Old 10-05-2013, 12:04 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Fleabit peanut monkey
 
Bob Kontak's Avatar
 
Join Date: Nov 2007
Location: North Canton, Ohio
Posts: 20,732
Garage
Is three psi normal or acceptable? I know (think) the old ones are less than CIS but three seems pretty wimpy.
__________________
1981 911SC Targa
Old 10-05-2013, 04:47 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
Join Date: Jul 2007
Location: Fort Worth
Posts: 112
Garage
If memory serves, 3-5#'s is what Webers like.
Old 10-06-2013, 01:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
Join Date: Jul 2007
Location: Fort Worth
Posts: 112
Garage
So I verified fuel is getting to each carb, whether or not its enough I don't know.
Regardless, I should be able to see fuel pouring in carb while looking down the horn with the fuel pomp running, right?

My internet is down so I can't look at the Weber diagram on this little phone.
Old 10-06-2013, 02:31 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Fleabit peanut monkey
 
Bob Kontak's Avatar
 
Join Date: Nov 2007
Location: North Canton, Ohio
Posts: 20,732
Garage
You are right, Bro. I did some searches and 3-3.5 is correct. Sorry about that. I am used to CIS with monstrous pressure.
__________________
1981 911SC Targa
Old 10-06-2013, 03:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered
 
Join Date: Jul 2007
Location: Fort Worth
Posts: 112
Garage
No worries. Its all part of the enjoyment of ownership. Thankfully there is tons os knowledge on this awesome forum.
Old 10-06-2013, 04:09 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered
 
Join Date: Jul 2007
Location: Fort Worth
Posts: 112
Garage
I'm still confused why the float bowls aren't filling up.
Old 10-06-2013, 08:59 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered
 
thumbdoctor's Avatar
 
Join Date: Mar 2010
Location: ST Lazare, Quebec
Posts: 218
Garage
On some Weber set ups there are filter screens in the fuel entry banjos (on the carburetors). You will need to remove the banjo bolts check the screens. Place a container under the banjos while someone turns on the ignition. If no fuel passes through the banjos, then your fuel pump isn't working or your fuel filter is blocked. No, there should not be fuel appearing down the throttle throats unless you operate the throttle linkage.
__________________
Porsche, aucune comparaison
Old 10-07-2013, 03:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered
 
Join Date: Jul 2007
Location: Fort Worth
Posts: 112
Garage
I pulled the banjos, looked/cleaned the screens but didn't check flow at that location because I check for flow just before the line enters the banjo. There was flow just before the banjo at each carb. Also, there is no visible fuel down the throat when the throttle linkage Is actuated.
Old 10-07-2013, 09:40 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered
 
Join Date: Jul 2007
Location: Fort Worth
Posts: 112
Garage
I pulled the banjos again and made sure there was flow. Still no avail. Is there a chance both sets of carbs have stuck floats?
Maybe the pump can produce some pressure, but under load can't flow?

Old 10-07-2013, 09:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Reply


 


All times are GMT -8. The time now is 03:30 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.