Help! Fuel Pump Not Pumping When I Turn The Key!

[1905 adam 0]

Hi,

 

My completely standard 1987 205 1.9 gti was running perfectly. Three days ago it cut out while idling and now won't re-start. I've checked that there's a spark at the plugs. I've disconnected the supply pipe from the fuel rail and found that, when I turn the key, no fuel is delivered. But if I connect the pump directly to the battery then there is fuel at the rail. When I turn the key, I do not hear the pump prime, which I normally would. So I'm assuming I have a relay problem.

 

My questions:

 

• 1. Am I right to assume it's a relay problem? What else might it be?
• 2. Is the tachymetric relay the same thing as the fuel pump relay?
• 3. Which one(s) on my car is/are the tachy and fuel pump relays? I've attached photo's of all the relays I could find. (The big black one and the brown one sit in a plastic box next to the near side headlight. The two green ones are mounted next to the washer bottle.)

Thanks a lot!

 

[welshpug 1,666]

the black cartier unit is the tachymetric relay, this is the fuel pump relay.

[1905 adam 0]

Thanks welshpug!

 

And do you think this must be the issue? Or what else could it be?

[Miles 331 1 Cars]

Could be the fuse depending where you are testing the Fuel Pump, Other than that the Relay's are known for failing as a fair amount of current flows thru them

[1905 adam 0]

Thanks Miles. Where would I find said fuse? I've checked all the fuses at the front of the fuse board.

[1905 adam 0]

If I want to test whether power is going to the relay, can anyone tell me which number connector in the above photo receives the voltage? Thanks!

[welshpug 1,666]

closest one to the driver.

[Miles 331 1 Cars]

30 on all relays is the Power in. 87 or 87a are the power out,

[1905 adam 0]

closest one to the driver.

 

on the fuseboard? ie. the blue one in my above photo?

[pug_ham 245 3 Cars]

 

on the fuseboard? ie. the blue one in my above photo?

 

Yes, power to the relay is directly from the shunt box / power distribution block in the engine bay, it is permanently connected & an ignition switch closes the relay to send power to the fuel pump etc.

 

g

[1905 adam 0]

30 on all relays is the Power in. 87 or 87a are the power out,

 

So I have 12.26 volts going into connector 30 and only 0.28 volts coming out on 87 and 87a.

 

Suggests it's dead, yes?

[Miles 331 1 Cars]

Is that with the ignition on and or cranking?

[petert 601]

Pump won't prime until the engine is rotating and the ignition coil is firing.

[Anthony 1,003]

Pump won't prime until the engine is rotating and the ignition coil is firing.

That's not entirely true - it should also energise with a voltage on the starter solenoid wire, even if the starter doesn't turn the engine over.

 

The general point you're making is entirely correct through - you won't get voltage on 87 and 87a without the key turned to the crank position even if the relay is working correctly.

[1905 adam 0]

The 0.28 voltage was with cranking.

 

Yes to Anthony's point, I normally hear the pump prime without cranking.

 

Anyway, just want to say a big T H A N K Y O U ! ! to you all!

 

I have swapped the relay for a new one and I have my pug back!