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Re: New to me - 72 96 V4 - Engine Cutout problem? Posted by eric in vermont [Email]  (#2058) [Profile/Gallery]
(more from eric in vermont) on Fri, 30 Dec 2022 06:22:10
In Reply to: New to me - 72 96 V4 - Engine Cutout problem?, Glenn T. Fearon, Tue, 27 Dec 2022 10:22:39 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Hi Glenn,
Just seeing your post today- hope I don't confuse things. Much of what was advised is exactly right. I've had much experience with vintage Saabs and fuel issues. Let me summarize and add a couple of things that will help.
1. The Weber 34 carb is a great choice for a VSaab and one of the first things I do is replace the old leaky FoMoCo or Solex with one of these.
2. The Weber 34 can have issues when hot. This is due to the carb inlet being over the thermostat housing which can cause vapor lock. One way to fix that or prevent that, is to use an electric fuel pump. So most people do both at the same time- Weber 34 and an electric fuel pump. Bad cases call for a phenolic spacer under the carb or a heat shield over the thermostat housing.
3. As Jimmy said, the best location for the electric pump is near the fuel tank, as they like to "push" fuel, not "pull" fuel. As he said, under the rear seat is ideal.
4. Put in a fuel filter between the tank and the pump. I like a see-thru filter for that application so I can see if it's getting clogged up or if it's starved for fuel. Note that it will never be FULL of fuel- about half full is right. I never use the metal cylinder ones that come with a new electric pump.
5. Speaking of filters, you have at least two in your system and either could be clogged. There's the one right in front of the pump- the metal cylinder- the one Bernie pointed out. Could be clogged. Also, the Weber 34 has a fuel filter. See diagram Item 4: https://www.piercemanifolds.com/category_s/235.htm
This filter is the last stop before the carb itself, so hopefully, the other filter took care of the junk. It might be worth it to remove and clean it.
6. As someone else said, get rid of the pressure regulator. Normally the Weber 34 likes 2.5 to 5.0 PSI, so get a pump that delivers that and ditch the regulator. I like the Airtex E8016S fuel pump.
7. I've never had the "collapsed fuel line" issue with any of my VSaabs, but I could see it could happen, especially if they've been replaced with newer material. The old Saab stuff tends to get rock hard and the new stuff softens and could collapse. I'd probably remove the hose end from the regulator you have now and blow back into the tank and see if there's resistance.
8. One other thing that I've done is to drain the tank thru a filter and see how much junk comes out. The fuel drain is in the center, right behind the rear axle. I use a paint filter in a funnel. That way, you know what you're dealing with.
9. Finally is the tank vent. This tends to be more of a problem with Sonetts. When the fuel starvation problem occurs, remove the gas cap and see what happens. If it fixes it, it could be a blocked vent.
So all that said (whew!), I'd get an Airtex pump, mount it under the rear seat along with a see-through filter, get rid of the existing pump and regulator, and go from there.
Let us know how it goes!
eric in vermont
, Fri, 30 Dec 2022 06:22:10 <-- Viewing This Message, Sat, 31 Dec 2022 04:29:30, Sun, 8 Jan 2023 14:17:48, Wed, 28 Dec 2022 08:17:27
, Wed, 28 Dec 2022 10:01:08
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