Replaced Fuel Pump Relay, Worked For A Day Then Stopped. - Mechanical & Electrical - MX5Nutz Forum

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Replaced Fuel Pump Relay, Worked For A Day Then Stopped.


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#1 just_a_red_94

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Posted 01 August 2020 - 11:24 AM

Just replaced my fuel pump relay which fixed the lack of power to the fuel pump on ignition. Worked all of yesterday. Try to start the car today and it seems like the new relay has died too. Any ideas?
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#2 just_a_red_94

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Posted 01 August 2020 - 11:28 AM

Forgot to add that when I re-install a relay bypass straight to the battery everything works great
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#3 Zed.

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Posted 01 August 2020 - 11:58 AM

Forgot to add that when I re-install a relay bypass straight to the battery everything works great

check wiring @ relay plug,

 

the bypass just feeds power from battery to pump.

 

continuity test the earth connection & the 'trigger' wire from the ignition switch.

 

also, what car? mk1 1.6 cars have a fuel pump 'deadman' switch in the airflow meter, this can playup & having the afm unplugged will cause issues :blink: 

Rich.


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#4 just_a_red_94

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Posted 01 August 2020 - 12:52 PM

Thanks rich. It's a 1.8 94. Can get the fuel pump running now with the bypass but the engine won't start. Cranks fine. Will check the ignition wiring.
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#5 atlex

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Posted 01 August 2020 - 08:12 PM

there's more than one relay involved, there's the fuel pump relay and then there's the injector relay and they all need to be working properly. I had an issue with the fuel pump not priming, replaced the fuel pump relay and the ignition relay, it was actually the fuel injection relay (in the engine bay fuse and relay box) that had gone. Get a paperclip and bridge that one too ;)


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#6 just_a_red_94

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Posted 02 August 2020 - 01:00 PM

Thanks for the suggestion, upon inspection the plastic surrounding one of the main relay connections is browned and slightly melted. Which two of the four relay connectors do I need to jump without blowing a fuse?...


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#7 atlex

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Posted 02 August 2020 - 07:51 PM

Thanks for the suggestion, upon inspection the plastic surrounding one of the main relay connections is browned and slightly melted. Which two of the four relay connectors do I need to jump without blowing a fuse?...

the side of the relay should tell you ?


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#8 just_a_red_94

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Posted 03 August 2020 - 09:35 AM

Thanks. It was indeed that main relay! Have ordered a new one and in the mean time got the jumper in. Thank you very much for your help!


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