|
||
|
12th April 2020, 14:38 | #1 |
Moderator/Club Shop
MG ZT 1.8t+. No.3 of 4 in Sunspot Yellow & Ford Fiesta in Black. Join Date: Aug 2010
Location: Rattler Farm
Posts: 22,568
Thanks: 9,270
Thanked 15,645 Times in 6,806 Posts
|
Fuel pump relay
Any reason why this relay should fail less than 6 months since a new one was fitted. Banana would start but then stop. No sound of the pump running So swapped the relay over and the pump was heard. Now runs ok. Got a couple of new ones on there way to me. Going to keep them in the car, just in case.
__________________
233,431. That’s our second meet done, no.3 next weekend. onen hag oll |
12th April 2020, 15:03 | #2 |
I really should get out more.......
A Reasonably Priced Car Join Date: Jan 2014
Location: Burton Latimer
Posts: 2,530
Thanks: 408
Thanked 1,064 Times in 712 Posts
|
Poor earthing could be the cause of the issues, the relay may be in receipt of a good 12v supply, but if the earth has high resistance, this may result in poor relay operation causing tarnishing of the internal contacts, leading to failed operation.
|
12th April 2020, 17:16 | #3 |
Moderator/Club Shop
MG ZT 1.8t+. No.3 of 4 in Sunspot Yellow & Ford Fiesta in Black. Join Date: Aug 2010
Location: Rattler Farm
Posts: 22,568
Thanks: 9,270
Thanked 15,645 Times in 6,806 Posts
|
1.8t under the bonnet.
__________________
233,431. That’s our second meet done, no.3 next weekend. onen hag oll |
12th April 2020, 17:23 | #4 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,386
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Bob,
The fuel pump relay is in the passenger compartment fusebox, not under the bonnet. Is it R4 which has been giving trouble? Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
12th April 2020, 18:41 | #5 | |
Moderator/Club Shop
MG ZT 1.8t+. No.3 of 4 in Sunspot Yellow & Ford Fiesta in Black. Join Date: Aug 2010
Location: Rattler Farm
Posts: 22,568
Thanks: 9,270
Thanked 15,645 Times in 6,806 Posts
|
Quote:
There is a single yellow relay next to a smaller black one. Next row is a faded green one and next to it is the bright new yellow one, this is the one that I swapped over with the cooling fan relay, just like the AA man did. So what does the R4 one do? Does it stop the fuel pump working?
__________________
233,431. That’s our second meet done, no.3 next weekend. onen hag oll Last edited by FLYING BANANA; 12th April 2020 at 18:41.. Reason: Spellin’ |
|
12th April 2020, 18:58 | #6 | |
MG ZT Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
|
Quote:
I've attached the layout of the relays for you, and as an aside, all of the relays in the hardwired passenger compartment fusebox are the same, so if you suspect a defective fuel pump relay, then you can exchange it for the horn relay......minimal tools, and an easy audible test of the relay functionality Brian |
|
12th April 2020, 19:12 | #7 |
Moderator/Club Shop
MG ZT 1.8t+. No.3 of 4 in Sunspot Yellow & Ford Fiesta in Black. Join Date: Aug 2010
Location: Rattler Farm
Posts: 22,568
Thanks: 9,270
Thanked 15,645 Times in 6,806 Posts
|
So what does the relay do that I have swapped over with? Before the swap no sound from the fuel pump, when changed I can hear the pump and she starts.
__________________
233,431. That’s our second meet done, no.3 next weekend. onen hag oll |
12th April 2020, 19:20 | #8 | |
MG ZT Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
|
Quote:
Probably the main relay, without which the ECM is effectively powered down. I've attached the layout of the engine compartment fusebox, so you can identify which relay exactly Brian |
|
12th April 2020, 19:36 | #9 |
Moderator/Club Shop
MG ZT 1.8t+. No.3 of 4 in Sunspot Yellow & Ford Fiesta in Black. Join Date: Aug 2010
Location: Rattler Farm
Posts: 22,568
Thanks: 9,270
Thanked 15,645 Times in 6,806 Posts
|
So the R4 relay is at fault then, and not the fuel pump relay? I swapped it with R5 to get her started.
Thanks for your help Brian. Will get it sorted out as soon as the lockdown ceases.
__________________
233,431. That’s our second meet done, no.3 next weekend. onen hag oll |
13th April 2020, 08:46 | #10 | |||
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,386
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
I was correct so I think you owe me an apology. Quote:
Quote:
I'm glad to have been of help Bob. Remember, don't believe everything the breakdown services tell you. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. Last edited by SD1too; 13th April 2020 at 08:50.. |
|||
|
|