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Weber install question

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ahpook

ahpook

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When installing a Weber on a 1500, do
I need to install a fuel pressure regulator also? everything I seem to read suggests 2-4 psi is optimal.
thanks in advance.
George
 
If the pump you have now was feeding ZS's without any problems, you can likely just plumb it up without worry to the Weber.
 
I'm certainly installing an adjustable regulator on mine. From what I hear, the DGV is more afflicted by overpressure than certain other carb configurations. I can certainly let you know if it seems to make a difference.

-D
 
PUT a GOOD regulator on, not one of the cheapie, $14.95 Pep Boys specials.. Go to summit, or any of the others and get a good one. Probably around 35-40 buck. Make sure your hose from the pump to the regulator then the carb is as large a diameter as the fittings will take. Do a little research on the DVG/DVA carbs and set the pressure to fit. I can't remember what it is right now, just remember it's different than some DCOE's
 
Funny, I was just sitting down to write about a Weber 32/36 prob that I think is atributed to over pressure. I don't want to hijack the thread, so I'll sit back and see what I can learn on this one for a bit.
 
RonMacPherson said:
PUT a GOOD regulator on, not one of the cheapie, $14.95 Pep Boys specials.. Go to summit, or any of the others and get a good one. Probably around 35-40 buck. Make sure your hose from the pump to the regulator then the carb is as large a diameter as the fittings will take. Do a little research on the DVG/DVA carbs and set the pressure to fit. I can't remember what it is right now, just remember it's different than some DCOE's
Click to expand...

Agreed... I'm putting on a 'period' piece, see the eBay auction for the pictures. But I'll a) hook it up to a pressure gauge and make sure that it's working OK once it's installed, and b) have a filter inline as well.

Oh, and the required pressure for DGVs can be as little as 1.5 - 2 psi. The stock mech pump can put out about triple that. Here are a few links that I've found useful.

Installing a 32/36 DGV

Bob Owsinski's Weber conversion diary

Weber links (various)

Redline's DGV setup guide

Redline's DGV setup guide addendum

and I suppose I should include my own rebuild thread !!

-D
 
When I start the car it starts right up and runs for about 3 sec. Then 2nd try 5 sec., then 3rd try no problems. I can make the first two starts last longer if I pump the accel. 10-15 times (accelerator pump putting raw fuel down the throat) Once running I have no problems, but I installed a clear fuel filter just in front of the carb, and it only fills to about 1/8 full. I can't figure out how the carb is getting any fuel at all, but when I take the line off there is plenty of fuel flowing. I'm using a Facet fuel pump.

I obviously have a delivery problem at start up, but I can't figure out why the thing continues to run at all RPMs with no problems after it finally starts. It's somehow starving itself of fuel on the start until the engine is running consistantly, then it does a fine job. (though the filter would suggest it shouldn't be!?)

It works, so I hate to complain, but it is confusing. I've wondered if I need a regulator, or maybe more pressure to the carb. Oh, well, like I said it works. I'll keep playing with it until it doesn't!
 
John, I certainly wouldn't be surprised to find that overpressure is your problem. All sorts of strange things can start to happen...

I can rebuild a carb, but I don't understand them well enough to try to explain how a DGV would react to too much fuel, as far as the float rising too fast and the main jet etc etc. But those Facet cube pumps (the little square gold one?) can supply a pair of DCOEs, I would certainly think they'd overpower a DGV.

I searched for "fuel regulator (low, carb*)" on eBay, and came up with regulators from $14 to $200 or so. We certainly need one that's designed for carbs, it'd be no fun trying to fine-tune 3 lbs of pressure on a FI regulator that goes up to 100 psi! Perhaps a little nicer would be something like this .

On a side note, you're aware of / have ruled out the intake mani-to-head leak as a possible source of problems? That seems to be another common fault with this particular setup, although I'm not sure whether it would give the symptoms you describe.

Best,
Duncan
 
I have heard of the manifold leak prob and have checked visually. I'm not sure what the symptoms would be either, so I'm not really sure what I'm dealing with. I have noticed that with the idle screw backed off all the way I still have a pretty high idle, so maybe I do have a leak after all.
 
Well, as many have suggested, the easiest way to check would be to spray around the joint with carb cleaner, and listen for a surge in the idle. I've added to the links I posted above, which have a wealth of other information on setting the DGV, and common faults.

And now it's time to stop surfing eBay, and go to bed. /bcforum/images/%%GRAEMLIN_URL%%/smile.gif

-D
 
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