[T3] Fuel Mixture

[Adriel Rowley]

When romping the throttle, fuel mixture goes from 13.8 to as high as 14.5.  Do not know how accurate the latter figure is, but figure the fuel mixture should get richer right?

I did find out from a posting of Keith's that the ratio should be somewhat linear and cruise should be no higher than 14.1.  But nothing on W.O.T. acceleration.

I decided to go on Bob's advice and check the fuel output as per the posting below.  All I have is an eight ounce bottle, which took about 15 seconds to fill (no watch).  This is from the right side as to account for some loss due to the system.  So seems that it is getting enough fuel.  T.P.S. is properly adjusted, along with the basics.

Now what?

Oh and does pee yellow fuel mean anything?


Thank you,
Adriel 
1971 Squareback Sunroof w/ D generation D-Jetronic

> Date: Wed, 23 Feb 2011 12:39:15 -0600
> From: gbforsmo at gmail.com
> To: type3 at vwtype3.org
> Subject: [T3] Fuel Delivery
> 
> Jim Adney wrote:
> 
> *Gary Forsmo did some tests on pump delivery rate. I don't recall
> his**results exactly, but I think they were something like 3/4 liter
> per
> ** minute or about 1/4 gal/minute. If you traveled at 100 mi/hr and used gas
> at that rate, you'd be getting about 6 mi/gal. Having done 100 mi/hr in a
> Type 3, I can assure you that the gas mileage is at least 3 times better
> than that, even at 100 mi/hr.*
> 
> * Gary, correct me if I'm way off on your pump delivery rates.*
> 
> Following is my Email to Jim after he did a re-build on my Fuel Pump.
> 
> *My VW Fuel Pump Test to measure the volume of fuel it delivered.
> 
> I had a 2-gallon container to submerge the fuel pump in diesel fuel, and
> another container as a "catch receptacle".  I made up a 2-wire harness with
> spade connectors on one end (to attach to the electrical connectors on the
> pump) and on the other end of the harness, I used my jumper cables from our
> motor home 12-volt batteries.
> 
> With everything ready to go, it took 3 people to accomplish the test.
> *
> 
>    - *#1 person held the pump & "suction" hose in a container of diesel fuel
>    and the "delivery end of the hose" in an empty container
>    *
>    - *#2 person used the jumper cables to energize the pump*
>    - *#3 person operated the stop watch*
> 
> *We ran two tests, each 1 minute in duration.
> *
> 
>    - *Test #1 delivered 22.5 fluid ounces (665.404ml)
>    *
>    - *Test #2 delivered 24.0 fluid ounces (709.765ml)*
> 
> *Test #1 had a slight delay in delivering fuel.  I attribute that to the
> fact that, even though the entire pump was submerged, it needed a short
> period of time to "prime" the pump and eject the diesel fuel into the
> "catch" container.  Test #2 seemed to be a more accurate test for measuring
> the amount of fuel delivery.
> 
> Anyway, not knowing what to expect, I'm satisfied with the results.
> Delivery is slightly more than one fifth of a U.S. gallon per minute.
> 
> Does this appear to verify/confirm previous information that you or other VW
> "experts" have about the VW Fuel Pump?
> 
> FritoBandito - '69 T3 Variant, FI, MT
> *
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