TDI fuel pump priming?

The BASIC app is a diagnostic tool (see below)

- Automatic vehicle identification from VIN (Vehicle identification number)
- Read and clear diagnostic trouble codes from all control units that is installed in your car (i.e. Engine, Transmission, ABS, Airbag, Multimedia, Air conditioning, etc.)
- Multilanguage database
- Read information about control unit (i.e. Part number, Software number, Coding, etc.)
- Diagnostic data log sharing via email
- Battery status
- Connected cars history
- Gauges
- Engine, Equipment and Fault code lookups
- DIY manuals

If you want/need to make changes to your car you have to have the pro version.

Hi mate, i purchased the pro version, worth paying the little extra i think.


sime

For me it startet at first time and runs like never changed something. Are you sure that filter is correct installed and everything is leakproof.

Hi mate, i ran the the transfer fuel pump test twice until i could no longer hear any gurgling, i also filled the canister with fresh diesel also. Mine fired up straight away with the first turn of the key. Strange that you had problems starting it

I used the 'Transfer fuel pump (FP) test' yesterday after changing the fuel filter on my 1.6 tdi Golf Plus and the engine started immediately no problem. In retrospect what I would like to find out though is whether the other items on the list 'Test of aux fuel pump' and 'Initial fuel filling' should have been run before turning the key?

As ross tech procedure when you change the filter only have to perform transfer fuel pump (fp) test for 30 sec.

If the engine had extensive repairs such as injector replacement and/or fuel system flushing this process should be repeated no less than 3 times

New to the forum, only had the OBD11 dongle for about 2 weeks now but did the fuel filter on my 2012 Jetta Sportwagen 2.0 tdi this morning. Only took about 45 minutes from getting tools out to putting tools away. Pretty simple and straight foreword procedure, however i was unclear on one thing while I was doing it so I figured I would post about my experience. Started off by pairing with the dongle, then went into engine, typed in module 35 for fuel pump, cycled it just to make sure it was possible; it was. Next removed old filter and removed diesel in canister, cleaned any particles out. All pretty straight forward up until i realized i didn't have diesel to pre prime the system and wasn’t sure if i could do it alone with the pump. Did some snooping around on google and it looked like i could. Buttoned everything up and ran the pump 4 times (30 second intervals), until i couldn't hear any more air in the system. Fired up the car with the push button start and started with no hesitation! Let it run for about 4 minutes just to make sure it wasn’t going to die because it has happened to me in the past but it was in my ALH TDI. So, if anyone wanted to know if you can prime the system with no diesel to add manually it can be done.

I am thinking of doing mine as well soon. My car is a mk7 1.6 tdi. I have read that the procedures are different for mk6 and mk7. Is your car a mk7?

Same issue on my 2014 tdi sport wagon with Pro version. Would not activate pumps. Is there a different code than 35? Would appreciate any input Thanks

Once you see fresh diesel coming out and no air bubbles, you can stop the test. I don't think the order matters, once you select one option, wait, end test, select the other option, wait, end test, then select the first option again to be sure. The only thing that is important is to not run the pump dry for any reason.

Thought i’d share my experiences. I’m a new owner of a Golf 6 1.6 TDi. Specifically the 3 Door. I attempted a fuel filter change a few weeks ago as the previous owner didn’t seem too caring about it.

I bought the scanner for this, and researched heavily. Followed this forum and everything.

TLDR: IT DID NOT WORK. My engine was fuel starved and there was air in the high pressure lines. But it was an easy fix, and 800 miles after it seems to be running good (minus stuff i broke myself lmao). Higher miles per gallon too but that might just be placebo.

Now, the breakdown.

So. I switched the filter, and left the original diesel in. Didn’t drain the container, didn’t add more. Some sloshed out but not too much. I had easily 3/4 the container filled.

I primed the pump using BOTH “Electric Fuel Pump Relay” in output test, and “Transfer Fuel Pump” in Basic Settings. For 10 minutes. This moved diesel to the filter housing but, critically, it was NOT strong enough to pressurise and bleed the remaining air out of the top of the lines. This could be the 10 year old fuel pump showing it’s age, or could be because of the 1.6’s lack of an electric auxiliary pump for the fuel lines. I’m not certain

So, the fix. I tried cranking till my battery died, i had my friends jetta jump me while i tried cranking more and more. Nothing.
We cracked and bled the injectors, but no fuel was even getting to the Rail to have an effect with this.

A friend of his removed the fuel line going to the high pressure pump. Cranked until diesel poured out (this took 20 seconds or so). Put the line back, cracked the nut for the fuel rail, bled it, then bled all 4 injectors. It kicked to life after bleeding the first injector, but we did all 4 to be sure.

What would i recommend? I’d say fill the filter housing until it overflows. Make sure that if there is air in the housing, it’s as little as possible. Hell, you could turn on the pump before fully closing the housing to push air (and diesel!) out of the gaps to get rid of more.

If you do manage to get air in the lines, don’t panic, you can suck the air out using something for suction, your mouth if you’re desperate to avoid cranking the engine dry. If you aren’t worried about cranking? I’d recommend pulling the hose to the High Pressure Fuel Pump and waiting until diesel pours out consistently. Once that pump is primed adequately it should have enough pressure while cranking to push any air through, i’d do this in conjunction with an injector/fuel rail bleed.

(If anyone wants i have labelled pictures of the fuel system from the filter housing and to the high pressure pump to help explain, i don’t know how to link them here on mobile though)

After a filter change, no amount of cranking or priming helped. Only thing that helped get my 1.6 TDI going again was to get a pull down the road in 2nd gear.

Didnt need to split injectors thankfully.

Im not a deisel fan but many two pump systems are similar. 

Try loosening , but not remove, the fuel line immediately prior to entering the high pressure fuel pump located at the engine. Then run the the low presure fuel pump located at, or in , fuel tank until fuel appears at the loose fitting. Turn off the pump.

Now attempt to start the engine normally.   

Most cars now have a fuel pump kill switch to stop the pump in a crash.
Some cars used to have to be reset,,,, manually,,,, at the low pressure pump.
And also if the tank was run dry.    A real nusciance when refilling the tank on the side of the road, at night, in the midle of nowhere.

Good luck