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Mpi Fuel Pump Won’T Energise. Help!


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#1 Alice Dooper

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Posted 27 April 2018 - 01:20 PM

We changed our electric fuel pump as the original was on its last legs. Went through a couple of bad potholes and she lost power.

Anyway, found a few faults and niggles, mainly a britttle connector on the new pump wiring. Also replaced the fuel cut off and its connector. Had been having problems with my O2 sensor that we believed was down to the relay pack so swapped the relay out while we were at it.

Anyway, the car wouldnt idle after that and died under 2000rpm. Cleaned up the IACV which was a wee bit dirty and no difference. Thought it might be the new pump not supplying decent volume (eBay cheapies). So swapped it out for a decent facet one from mini sport.

Now theres no life coming from the pump at all!!! Ive taken it out and bench tested it and powered it up in tank and its good. Ive checked all the wiring from the pump earth and the feed to the pump back through the cut off to the relay and all is good. The relay is making all the right noises when energised and everything else seems fine. Fuses all fine, cleaned up all the connectors and I did reset the cut off - someone is bound to mention it.

Anyone any ideas?????

Am starting to get more than a bit 🤬🤬🤬.

#2 FlyingScot

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Posted 27 April 2018 - 02:46 PM

Energises on turning the key to II ?
If it does then drops out when cranking check the crank sensor and its connection.
Ive got an opened MFU (relay pack) which I use to check whats going on but you can use a multimeter to check it stays grounded.

FS

#3 Alice Dooper

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Posted 27 April 2018 - 03:20 PM

Energises on turning the key to II ?
If it does then drops out when cranking check the crank sensor and its connection.
Ive got an opened MFU (relay pack) which I use to check whats going on but you can use a multimeter to check it stays grounded.

FS

 

Afraid its not energising at all.  Was before I change the pump but would cut out below 2000rpm.  Crank sensor looks physically fine, but thats not saying much.  Starting to worry its the ECU.



#4 FlyingScot

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Posted 27 April 2018 - 04:15 PM

Check earth on ECU, MFU relies on “ground” being provided by ECU to pull in relay for fuel pump.

FS

#5 Alice Dooper

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Posted 27 April 2018 - 09:46 PM

Check earth on ECU, MFU relies on “ground” being provided by ECU to pull in relay for fuel pump.

FS

 

Thats the one ground that I haven't taken apart and cleaned up yet. 






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