Well i've spent the day replacing a generator with an alternator on my 1776 with twin kadrons. New fuel pump new rod new alt stand and backing plates. Drove it round the block, Now she runs like a pig. It sounds like it missing or something and is blowing slight black smoke. The manifolds are also very cold (is that unusual). The only thing i disturbed were the plug leads on 1+2, the fuel hoses and a couple wires on the altenator. I NEED SOME HELP PLEASE.
Aaron:cry:cry

[ Edited on 28-4-2007 by jaksc ]

[ Edited on 28-4-2007 by jaksc ]

did the rod lengths match?? btw.

checked 1 and 2 not incorrect ??

was it 12 volt b4 adding the alt. if not 6v coil needs upped to 12v!

changing fuel pump could mean rubber hose remnants in line to carbie needle valve ?
check & cln fuel filter

did u check timing ?u may have slightly moved dizzie with all them operations goin on

Rod length different to the one that came out
I have re-checked 1+2 again
It was 12volt generator before it came out
I will put a new fuel filter on today and check the timing.
I didn't disturb that much so i am at a loss to know what it is. Try again today! I disturbed one of the carbies slightly if it was sucking air would that have an affect.
Aaron

You'd be surprised what you can accidently bump or knock without even knowing when working on a veedub.. so check EVERYTHING!

esp fuel supply

and timing

Black smoke generally indicates rich fuel mixture, ditto cold manifolds, so I doubt extra air in the mix would be the culprit. Maybe fuel pressure too high? Or perhaps the old fuel lines were clogged and the carbs were set/tuned to suit this, the new lines have maybe freed up the flow a bit.

Also possible plug or lead failure under load.

All serious "maybe's" of course, but worth checking.

Spent the day trying to work out what i had done wrong. Took the new pump off and double checked the stroke. I was out by .1mm. So i put a another gasket to pack it up and got it just right at 4mm. I have also came down to the conclusion that it is slightly flooding for some reason. There seems to be plenty of pressure from the new pump. So it is off to the mechanics tommorrow as i need the car. I think it is flooding but still i am only guessing.
Aaron

Fuel pressure should be 1.5-2lbs according to Mr.Kadron,adjust with gaskets to match.

Got some crap caught under a needle and seat??

Looks like the new pump is putting out too much pressure and flooding the carbs. Maybe another new pump??? What are my options.
Aaron

just a stab hre...
u said rod lengths were different
why?
is the pump a diff brand?

Tested the pressure today and it was way to high and was flooding the carbs. Bought another new pump(different brand again) and it solved the problem. What is the difference between pumps???. Do i need to quote a fuel pressure when buying one???.
Aaron

Jaksc,
A lot depends on what your new fuel pump rod measured, the pumps pivot pin location and actuating arm manufacturing tolerances and how many gaskets you wind up using. A whole lot. Also there's where they are made can have an influence. For arguments sake a mexi Bocar might put out 3.5 psi max whereas a brazil brosol could do 4.5, and you need to cut down the rod or stack gaskets to lower the psi. I had to cut my rod to 100mm (was 101.1mm as supplied) and use 1 more gasket to stop my carb flooding. FYI I swapped a gennie pump and rod for an alternatior pump and rod.


Ctefeh

[ Edited on 3/5/2007 by ctefeh ]

Ctefeh
did you come up with the rod length and gaskets through trial and error or is there a formula to use to get the exact fuel pressure you want.
Aaron

VW had two sizes for the rod length.:thumb
If you look at the arm within the pump (turn the pump upside down and look in it!) you will notice one sits lower than the other. The short rod length matches the pump which has the arm level with the base of the pump housing, the long rod for the pump where the arm sits about 5 to 10mm in.

Jaksc,
A generator rod is supposed to be 108mm, and an alternator rod is supposed to be 100mm. I knew I had an alt pump and so needed a 100mm rod to start. After fitting up and measuring stroke etc I figured on 1 gasket but wound up using 2. I have a lathe so rod trimming isn't a problem.
Measured it with a psi gauge after sorting needle & seat problems (I wound up using the original needle & seat as the new one wouldn't shut off properly).

For a glazed-eye read of pumps/rods/alt/gens try this....

http://forums.aussieveedubbers.com/viewtopic.php?tid=50478 

Ctefeh

[ Edited on 7/5/2007 by ctefeh ]

[ Edited on 7/5/2007 by ctefeh ]

[ Edited on 7/5/2007 by ctefeh ]

That thread was excellent. Wish i had of known all that before i started. Thanks Aaron

Jaksc,
The Kads being pressure sensistive doesn't help much as it's another spanner in the works to deal with. Have you thought about a Holley adjustable low pressure regulator?

Bit spendy but it would be a definite fix and you can transfer it between cars or on-sell if you wish.


Regards
Ctefeh

Seem to have fixed the problem with another new fuel pump. Will look in to the pressure regulator also as a safeguard. Thanks heaps. There is more to this than i first thought.
Aaron