Sad day......... Fuel pump not working
- Thread starter 944 man
- Start date
944Volks
New member
Hi.
Thought id finally hear my project roar into life today.
Alas no.
Fitted new fuel pump. Nothing.
Jumped pump and it works.
But there is no power getting to connection near pump.
Check fuse 34. All seems good.
Fuel sender is working.
Haynes suggests inline fuse?
Or relay?
Can't find. Really suck. : (
Car is a 1986 2.5 with 3ltr conversion.
Thought id finally hear my project roar into life today.
Alas no.
Fitted new fuel pump. Nothing.
Jumped pump and it works.
But there is no power getting to connection near pump.
Check fuse 34. All seems good.
Fuel sender is working.
Haynes suggests inline fuse?
Or relay?
Can't find. Really suck. : (
Car is a 1986 2.5 with 3ltr conversion.
Chrishazle
Active member
DME relay provides power to the fuel pump when you turn the ignition on, if you're not getting a click click click from the fuel pujp when you turn the ignition on then the DME relay is the first potential culprit - which is why many FE Porsche owners (me included) carry a spare in the boot!
Chrishazle
Active member
Check OPC and online for price before you buy - and beware Ebay prices, some are optimistic to put it mildly! Also I have seen posts where a "new" item was found to be faulty, so your best bet is first find someone local to you who has a working 944/968 and try their DME relay, if the car then starts try your replacement - if it then does not start you know the replacment is faulty!
944 man
Active member
944Volks said:
DME stands for Digital Motor Electronics - in other words the Bosch ECU. The DME relay is in actual fact two separate relays within one case.
Turn on the ignition and the ECU/DME is energised. Start cranking the engine and when a pre-set minimum speed is reached, the ECU sends a control signal to the DME relay energising the fuel pump circuit.
944Volks
New member
Hi.
Got some time to look at it today.
Just some history. Bought blind off ebay. Drove it 200 miles. Only issue was hot start took alot of cranking.
When I got back i jet washed engine.
After 10 minutes it spluttered back to life and I drove into garage.
Changed fuels lines (weeping ) and fuel pump. And rotor arm. And soldered nasty connectors in wire feeds to coil. New battery,
Now will not start.
12v to coil.
Jumped DME fuel pump runs.
On cranking techo jumps to 2000rpm there bounces sparodicly around 500rpm.
Removed number 4 lead put spark plug in lead and held against body.
Cranked for 30 seconds, I got one weak spark.
What the hell could it be or what have I done wrong?
Thanks in advance. K.
Got some time to look at it today.
Just some history. Bought blind off ebay. Drove it 200 miles. Only issue was hot start took alot of cranking.
When I got back i jet washed engine.
After 10 minutes it spluttered back to life and I drove into garage.
Changed fuels lines (weeping ) and fuel pump. And rotor arm. And soldered nasty connectors in wire feeds to coil. New battery,
Now will not start.
12v to coil.
Jumped DME fuel pump runs.
On cranking techo jumps to 2000rpm there bounces sparodicly around 500rpm.
Removed number 4 lead put spark plug in lead and held against body.
Cranked for 30 seconds, I got one weak spark.
What the hell could it be or what have I done wrong?
Thanks in advance. K.
Don't bother with jump leads, just get a new DME relay. If you haven't got a spare you need a spare.
I would rather drive without a spare wheel that without a spare DME relay.
I would rather drive without a spare wheel that without a spare DME relay.
Sorry repeat of last post.. Deleted.
Don't bother with jump leads, just get a new DME relay. If you haven't got a spare you need a spare.
I would rather drive without a spare wheel that without a spare DME relay.
I would rather drive without a spare wheel that without a spare DME relay.
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