i have melted a fuel pump relay, replaced with a new-un, and it still doesnt work. i can hear the relay clicking, but she doesnt prime. if i bridge the connections with a wire, the pump works...


the connector is getting hot aswell, when running for 5 mins or so.

i know its prob the fuel pump drawing too much current (what should it be so i can test?)

any ideas why it still doesnt work with the new relay (even though i can hear it clicking), but works when bridged?



could it be that someone before has bodged and taken a live feed from it? i cant see any tampering though...

 

anyone got any ideas?

 

have you checked the heated seats fuse?

 

yup, it was me who stu was telling about it (the fuel enrichment thingy) a few weeks back...

 

i found that the INJ fuse had blown, but now the following happens...


if i use the melted relay, the relays electromagnet contact thingy closes when cranking, but doesnt prime (even though contacts are closed)


if i use the new relay, she doesnt close when cranking, but does prime if you close the contact by hand






how can i test the relays using a multimeter?

 

Eh?

How can that be happening!?!

That suggests that the pulses from the coil and the related circuits ARE working perfectly but the circuit through the contacts is open.

Where as that suggests that the pulses from the coil and related circuits are NOT working and the circuit through the contact is working correctly!

 

When my INJ fuse kept blowing, the actual wiring that connects to the fuel pump was shorting, have a look see if the wiring is damaged in any way

 

i know


i will have another look in the light tomorrow...


i am thinking that i may have a fucked new relay

 

no it was fucked when you got it

 

but... to take the cover off the new one, that i bought today, i had to break the little tab things off the cover... therefore i doubt ill get an exchange for free?



ah well 26 quid down the pan!

 

As far as the pump current draw goes, I would estimate around 14 amp on full chat. The relay itself is only rated at around 16 amp IIRC...

 

thanks, i will check once i get it running...




basically were testing the new relay to see if its fucked, it mite just be that one has one fault, and the other has another fault...

 

Common thing for the wire / connectors to the pump to be knackerd, had this on one of my old S2's

 

ok cool, i have to go to leeds now, but im going to get her in the air tomorrow and have a proper look...


im still sure my new relay is fucked, as even when connecting it to a differant battery, it doesnt close (the old, melted one does)



i think the electromagnet thingy must have been fooked on the new-un, but i cant get another till monday

 

sorted, new relay was fooked!

 

my mate had four brand new for fuel relays and they were all f-cked

 

Years ago on my S2 I added a second relay in parallel so each relay is only seeing half the current draw of the fuel pump. I did that after me and all me mates went to Southend on a particularly sunny summer sunday. As usual the traffic was chocka down the seafront and the realy threw a spack. The only way to keep the car running was to take the cover off the relay and hold the contacts shut with me fingers. My fingers almost melted off cos the relay was so damn hot!

 

yup, know the feeling... its fun trying to drive whilst pretty much touching you toes!