transmssion heat causing vapor lock

[Randy in Maine]

It should be about 1L in 30 seconds if I recall correctly.

[raygreenwood]

[Greg in GA]

update 2: I ran the fuel volume test again for one minute, while monitoring the system pressure....

the engine was off and I had a short hose on the output of the FPR. The battery was well charged.

the pump filled a 1 quart container completely in one min.

the pressure on the system stayed at 60-70psi!!

as soon as the pump was turned off, the pressure in the system returned to 35psi.

These results don't make any sense. Unless the FPR is still the culprit.
_________________
1969 Beetle
1974 Westy 1800cc FI conversion, L62H

Need a really good mechanic for your VW bus? Consider making an appointment with Colin (Amskeptic) next time he passes thru your area.

[SGKent]

[raygreenwood]

[Tcash]

the pump filled a 1 quart container completely in one min.
Fuel pump Volume is good. That means there is no restriction in the tank or suction side of the pump.

the pressure on the system stayed at 60-70psi!!
This is too high.
Go down to pg 20 and run the Fuel pressure regulator test.
https://www.thesamba.com/vw/archives/manuals/afc_f...Manual.pdf

[Wildthings]

[Greg in GA]

I will try and find another FRP (or order one)to test.

The pump is from busdepot, part number 043906091. It did look different than the picture in the catalog. I just figured since I had the same symptoms before the pump was replaced, that the new pump was fine (and not the problem).....but it could be.
_________________
1969 Beetle
1974 Westy 1800cc FI conversion, L62H

Need a really good mechanic for your VW bus? Consider making an appointment with Colin (Amskeptic) next time he passes thru your area.

[Greg in GA]

update 3: I swapped in a good FPR, no change. I then took the FPR off, turned the pump on and let the system dump into a can...still getting 50 psi. I pumped a liter out of the tank hoping it would flush the system, no luck.

Any suggestions?

I was thinking of taking the spark plugs out to see which one is running rich.
_________________
1969 Beetle
1974 Westy 1800cc FI conversion, L62H

Need a really good mechanic for your VW bus? Consider making an appointment with Colin (Amskeptic) next time he passes thru your area.

[Wildthings]

Assuming you are reading your pressure at the port on the fuel manifold on the left head you have to have a blockage between there and where the FPR hooks up. Maybe a hose has come apart inside of thus restricting itself.

I had an orchard bee build a nest in a hose one time and it drove me nuts figuring out what had happened. This was a suction hose though, I think a similar nest on a pressure hose would blow through.

[Tcash]

As Wildthings says. It may be a restriction.
Pull the hose off the FPR (fuel pressure regulator) an run that into a can and record your pressure.
Bypass the cold start valve and test.
Pull the hose off that goes from the FPR to the gas tank and see if you can blow through it.
Good luck
Tcash

[raygreenwood]

[Tcash]

Are you connecting your gauge to the middle of #30?

Type 4 Hex head washer for the fuel pressure testing tap

[Greg in GA]

You .....removed.....the fuel pressure regulator......and then turned the pump on and the gauge STILL reads 50 psi?.....

correct, also, I'm connecting in the middle of #30

1. If the line had a restriction in it somewhere between the pump and the gauge.....the gauge would be on the outlet/downstream side and read virtually 0 pressure.

right, I'm thinking between the gauge (which is on the test port on the rail) and the end of the hose

If its still set up like stock your fuel pressure test nipple is on the left side or the engine bay near cylinders 3 and 4....and the fuel pressure regulator is on the right side of the engine compartment near 1 and 2....right?

correct, completely stock vw

2. If you removed the fuel pressure regulator from the end of the line and are letting that open hose run into a bucket.....and getting 50 psi......then it is correct as everyone is noting.... that you can have at least a partial restriction somewhere in the lines between cylinder #4 and the cold start valve....or between the cold start valve and cylinder #2....or even a crimped steel Tee between cylinders 2 and 1 or the hose that connects to the fuel pressure regulator.

Or......and I always have to ask.....how sure are you of your gauge accuracy?

sort of, when the new engine was installed, we tested the pressure then and it read in the 27-35 range depending on vacuum.

If you see no visible kinks in steel lines or hoses.....I am betting its a flap of the inside lining of the hose. Ray
_________________
1969 Beetle
1974 Westy 1800cc FI conversion, L62H

Need a really good mechanic for your VW bus? Consider making an appointment with Colin (Amskeptic) next time he passes thru your area.

[skills@eurocarsplus]

I suspect a bad pump myself

hook your pressure gauge directly to the pump outlet and see what you have. that will confirm either a bad pump or a restriction up stream.

and yes, electric pump can fail and give TOO much pressure. uncommon, but I have seen it.

ray, if the inside of the hose were bad, typically you'd have good pressure, but no volume
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[raygreenwood]

[Tcash]

[SGKent]

if it were me I would

1) test the gauge to be sure it is accurate,

2) remove the hose from the 1-2 rail to the FPR at the rail. Remove the hose from the filter and connect it to another piece of hose. put it into a safe jar. Blow low pressure air thru the line until all the gas is out. Put the end of the hose wrapped in a wet towel and blow compressed air thru the lines backwards. Then hook it up and test it again.

FWIW when I rebuild my bus I ran a glass bead gun thru the rails and also cleaned the outside. Then I washed them in hot soapy water and blew the snot out ot them with compressed air before installing them. That way I was sure the whole path was clean of debris.

Last - there are no home brew parts on this like homemade rails or anything like that are there?
_________________
“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[raygreenwood]

[Wildthings]

Remember that his gauge is showing 35 psi after shutdown, just like it should. This doesn't sound like a gauge problem at all to me, nor does it sound like a fuel pump problem.