im trying to find the fuel pump relay on the 1990 xr3i efi.
can someone tell me which one it is please?

 

Its the pink relay under the dash. If you look up from the drivers footwell you should see it.

 

oh someone else told me it was the yellow one under the dash?!?!?!

 

If your car is EFI then it will be yellow yes

Whats the problem you are having as its rare for those to pack up

 

was just away to ask the same question,know its not the pink one though cos the efi cars aint got a pink one,thats why i was asking really as every scort i have had has had a pink fuel relay and noticed the lack of said pinkiness

 

You need not bother now

The reason the early 89 and before cars have pink relays is because they are tachometric relays, as the cars have no ECU's. The late ones are EFI, so the ECU controls the relay, hence why its more reliable

If you ever get a fuel pump problem on an EFI, 99.9% of the time the inertia switch will need reseting

 

i have no fuel pump but i think it may be the megasquirt playing up.
i will find out tomorrow when i get someone to look at it

 

You have no fuel pump?

 

well its not working!

 

Ah i see.

You wana be checking the inertia switch thats always a prime suspect!

Underneath the spare wheel.....

 

done that.
pump works as i have put power down the wire and it goes.
but i think its the megasquirt

 

Then its guna be trial and error i think.

Problem is its got megqsquirt no-one else is going to know how its wired etc

 

What? Why is an ECU controlled relay more reliable than a tachometric relay? They are both subject to poor connections and water damage.

 

it was a short in the loom.
i got it sorted.
then i had a major misshap.
i nipped 2 wires in my inlet manifold by mistake and its fried my loom.
absolutely gutted now.
cant believe my bad luck is continuing.
got to take wholecar loom out and start again.
very pissed off to say the least

 

Because the relays in MFi cars and alike firstly are very primitive and poorly made, but not only that they are all very under-rated. I dont think theres a MK3/4 on the planet that hasnt melted its relay, as soon as the pump gets a bit old and starts drawing a little more current they just burn out. They are rated 16A which is BORDER LINE for requirements.

The relay on an EFI car is rated at 30A, so there is A LOT less chance of failure/fire

 

What wires did you cut? And presumably you did them at the same time for this to happen

 

The tachometric relays are more advanced than the later relays, hence 'tachometric'. I fuel pump should only draw 4 amps, so a 16 amp rating is not a problem. If your pump starts drawing more than 10 amps your pump is the problem, not the relay.

 

Yes i am aware the relay in an EFI car is just an industry standard SPST relay, but in terms of quality and reliability it is SUPERIOR to the tachometric items in MK3/4's.

Surely if a tachometric relay was so technologically advanced compared to an ECU cars today would still use them - which they don't.

Tachometric relays are cheap pieces of shit used to overcome the problem of not having an ECU on an MFI car.

 

Who said a tachometric relay is more advanced than an ECU?

Why is not having an ECU a problem on MFI cars? Most people would say the opposite.

 

By that comment you are saying tachometric relays are better, but they're not, as i said they are cheap pieces of shit with poor construction quality used to overcome not having an ECU because a car is MFI.

And of course having an ECU is better in 99% of ways, MFI is known for being a big pile of wank as well as a lot of limitations - and thats WHEN its working properly........

 

cut the tps wires.
have spent all day stripping car and rewiring it.
pain in the bloody arse

 

TPS???

Throttle position sensor wires? That fried your loom?