Wont start
Posted
#1613625
(In Topic #220405)
Old Timer
Posted
Local Hero
on 84.5 and above Cabriolets there are 2 fuel pumps
with either type of injection systems that is CIS or DIgifant.
If you turn on the key and hear the fuel pumps Whine, that is usually caused by the in-tank fuel pump failing from age, The filter screen clogged or off, and the pump has picked up trash causing no fuel flow, and or the interconnect vibrations hose holeing.
I will tell you on an OEM in-tank pump that failed on me it when I took it out to replace, the interconnect hose had given up the ghost as it tore when trying to remove it, so you might as well buy about a foot of submersible fuel line and replace it with the pump.
I have a how to with a trick on Keeping that filter screen from falling off when going back in the Archive Section/How-to's
View topic: My DIY list of things for a 90ish Cabriolet (digifant2) part 1 - The Mk1 Golf Owners Club
Specifically:
1984.5-1993 mk1 How to change your in-tank fuel pump | Volkswagen Owners Club Forum
WARNING's
Do in a Well Ventilated area, with
1/2 to 3/4 of fuel in the tank before removing the Sending Unit.
Disconnect the Battery Ground post.
Remove Fuel Cap
What do Divorces, Great Coffee, and Car Electrics all have in common?
They all start with GOOD Grounds.
Where are my DIY Links?
They all start with GOOD Grounds.
Where are my DIY Links?
Posted
Old Timer
Posted
Old Timer
Wont start
Do you have a spark
If not at the plug do you have a spare on the ht led from the coil.
Once spark is established. Do you have fuel. Simply remove a plug and turn it over with the coil hit lead removed. You will quickly smell fuel.
If you have spark and fuel then you need to get a little deeper into timing, compression etc. But if one of them two items are missing them tracking down why simply no fuel or no spark is much easier.
You mention you don’t know history of the car just be careful items like cam belts are sound as you don’t want it to fire up and then destroy itself.
If brought as a non runner by someone who took the engine apart and then rebuilt check valve timing marks are lined up, ignition timing is not 180 out or just randomly out. Head bolts are tight. (I brought a pug 306 once that would not start after rebuild and they simply forgot to tighten the head ).
Once you done some checks and if it still not found I am sure if you keep explaining what steps you have taken the huge knowledge on here can guide you to fault find.
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Posted
Settled In
Wont start
But on my 85 gti I changed both pumps lines filters accumulator distributor plugs to find out it was only a fuel pump relay
May be worth having a look at that first
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Posted
Old Timer
Posted
Old Timer
Wont start
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Posted
Settling In
Wont start
I located the fuel pump relay and took the cap off, then wedged the microswitch closed. This made the fuel pump run and the car started. I wonder if it was the immobilizer causing it, as once it had ran for a few mins I returned the relay to normal and it's been fine since. Give it a try.
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Posted
Settled In
Wont start
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Settled In
If so and the car hasn't run for a long time, I would start by draining off all the old fuel and inspecting the fuel tank for rust.
These cars are notorious for rust and debris in the tank which is caused by either a rusty fuel filler or tank internals. If you try and start the car with stale fuel and rust in your tank it will drag it through the entire fuel injection system and you will end up with the headache of having to replace just about everything in your system.
Posted
Old Timer
Posted
Settled In
The fuel starvation could be caused by debris in the fuel system, if there is rust in there it would cause an intermitent fuel flow.
Its also worth having a look inside your fuel filter and see if there is rust residue in there (you will need to cut it open and replace with a new)
As I said I would start at the tank first and then work your way through for flow past the pump the accumulator and so on.
Another thing to check (the obvious) is if there is actually fuel in the tank! My fuel gauge got stuck at 12 full when it was actually empty, caused me a couple of hours of head scrathing before I worked that one out.
Posted
Regional Host NE
if it is a fuel issue
Do not know a lot but willing to help if possible
1989 Sapphire Blue Mk1 Cabriolet KR
1985 Atlas Grey Mk2 GTI 2.0 ABF
1989 Sapphire Blue Mk1 Cabriolet KR
1985 Atlas Grey Mk2 GTI 2.0 ABF
Posted
Old Timer
Posted
Settled In
I would start by draining off all your old fuel and start with fresh, when you say you put 12v direct to the pump and it worked, do you mean you saw it pump fuel or just make a noise?
Did you try opening the connection to the accumulator to see if fuel was getting that far?
If not, at that point I would just try a known working pump, then check for any blockage between the pump and fuel filter next.
Posted
Old Timer
Posted
Local Hero
Tells you how to test the fuel pump relay….
https://vwgolfmk1.org.uk/forum/index.php?page=topicview&type=misc&id=technical%2Felectrics_2%2Ffuel-pump-relay_3
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
Posted
Old Timer
Posted
Local Hero
Just go carefully and make sure the battery is disconnected when working on it..
Alot depends on who fitted the immobilizer and how good they were on hiding wires etc…
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
Posted
Old Timer
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