No Fuel, bad relay? but pump can be made to run?

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Ok checked both relays, and both are seemingly dead.
Checked some other relays from another car to check I am doing it right and those worked fine.
So not sure how the car managed to even run at all with the second dead relay.
So looks like I need two new ones.
 
naki said:
Ok checked both relays, and both are seemingly dead.
Checked some other relays from another car to check I am doing it right and those worked fine.
So not sure how the car managed to even run at all with the second dead relay.
So looks like I need two new ones.
Click to expand...
As Above, if it has a diode in it, you will have to test the relay with the Pos and Neg in the right orientation...

Usually it is 85 to Positive and 86 to Negative....

Try the test with the pos and neg one way round then the other and see if you get a result!
 
Ah ok, so the tin top relays are different to other 30a relays.

Is that why they are so expensive?
I searched online with the Bosch part number, and it comes up with some Bosch items in brown plastic too? Would they be the same, but just a later design (cheaper to make with tin?) I assume so if they share the same p/n?
 
naki said:
Ah ok, so the tin top relays are different to other 30a relays.

Is that why they are so expensive?
I searched online with the Bosch part number, and it comes up with some Bosch items in brown plastic too? Would they be the same, but just a later design (cheaper to make with tin?) I assume so if they share the same p/n?
Click to expand...
Most likely if it has the same Part Number...
 
Saint.V8 said:
As Above, if it has a diode in it, you will have to test the relay with the Pos and Neg in the right orientation...

Usually it is 85 to Positive and 86 to Negative....

Try the test with the pos and neg one way round then the other and see if you get a result!
Click to expand...

Am glad you mentioned that!
So one relay works with + 86 & earth 85!, but not the other way round.
And the other relay is totally dead.
Any idea common way they dye? Looked inside and nothing looks obviously burned out/ damaged.
 
naki said:
Am glad you mentioned that!
So one relay works with + 86 & earth 85!, but not the other way round.
And the other relay is totally dead.
Any idea common way they dye? Looked inside and nothing looks obviously burned out/ damaged.
Click to expand...
The coil usually gives up the ghost, and sometimes with no external proof...

Maybe I had the pin orientation wrong, but aslong as you get a reuslt one way and not the other, it means it is working...

As for the second one that nots works either way, Time to replace it I think!

EDIT: Yep relooked at the schematic ... 86 is Positive, 85 is Negative on a Diode Relay
 
Last edited:
Saint.V8 said:
The coil usually gives up the ghost, and sometimes with no external proof...

Maybe I had the pin orientation wrong, but as long as you get a result one way and not the other, it means it is working...

As for the second one that nots works either way, Time to replace it I think!

EDIT: Yep relooked at the schematic ... 86 is Positive, 85 is Negative on a Diode Relay
Click to expand...

was just curious really. as electronics are not my strong point, but always trying to learn why things happens. though i find it easier to grasp when i can actually "see" the damage/ why its had it.

looking online for a new relay, unless anyone has one for sale???
 
I can confirm the car is running again. Brand New Bosch relay fitted just now, not tin top but the same part number.
Thanks for all the help and advice from everyone.
Non stop learning curve this motoring lark!

I now know how to test relays, and have just bought a proper test light too!
 
i think i have been fairly lucking, as have not really had many starting issues on this car in the 12yrs i have owned it. only flat battery problems which was traced to a faulty battery, and some misfiring in winter only.
but this is the best way to learn, by sorting problems. only way to gain new skills. thanks to the forum
 
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