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BlackCosmos
Padawan
Joined: 01 Jun 2009
Posts: 94
Location: essex
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 Posted: Tue Jun 30, 2009 7:55 am Post subject: Fuel Pumps.. |
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| been having sum issues with the external fuel pump im running on me t25 with wrx fitted..wots the best pump suited or is it best to find sum one to mod tank to take subaru in tank pump?? thanks.. |
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MostlyMonki
Jedi Master
Joined: 09 May 2007
Posts: 419
Location: Bristol
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| Posted: Tue Jun 30, 2009 8:45 am Post subject: |
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I've got a sytec motorsport 5 bar pump on my wrx bug.
what pump you running? and whats the problem?
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'72 Ratty Bug - Subaru EJ20 Turbo motor. |
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BlackCosmos
Padawan
Joined: 01 Jun 2009
Posts: 94
Location: essex
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| Posted: Tue Jun 30, 2009 12:56 pm Post subject: |
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| a cossy pump,meant to be 6bar..when started the fuel pump relay clicks and interfers with the fuel pump..seems to improve when hot..had electrics checked been given the all clear on them..may have to get subaru diagnostics done..have put new fuel tank and pump on and checked maf..any ideas?? |
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MostlyMonki
Jedi Master
Joined: 09 May 2007
Posts: 419
Location: Bristol
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| Posted: Tue Jun 30, 2009 1:03 pm Post subject: |
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do you mean that when its running the relay intermitantly clicks (i.e. not just once when you start it)? if so sounds more like a relay problem than a pump thing...
can you give any more details (step by step styliee)?
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'72 Ratty Bug - Subaru EJ20 Turbo motor. |
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BlackCosmos
Padawan
Joined: 01 Jun 2009
Posts: 94
Location: essex
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| Posted: Tue Jun 30, 2009 2:09 pm Post subject: |
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| when running the relay clicks intermittently,think its the feed to the pump being interferred with..even if i by pass relay it still gets problems on tick over/or driven..seems to improve when the engines hot..have changed relay,fuel tank and pump..had electrics checked theyre ok too..was ok just started out the blue?? |
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potholebill
Force Sensitive
Joined: 25 Mar 2007
Posts: 14
Location: suffolk
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| Posted: Tue Jun 30, 2009 7:38 pm Post subject: |
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| Defo sounds electrical, have you checked the ground connection to the relay, vibration maybe causing it to come loose and click off and on. |
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MostlyMonki
Jedi Master
Joined: 09 May 2007
Posts: 419
Location: Bristol
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| Posted: Tue Jun 30, 2009 7:58 pm Post subject: |
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the earth or the relay goes back to the ecu iirc.... the earth on the pump might be worth a look though. whats it like if you just leave it idling after starting without driving? same thing happening?
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ElusiveStranger
Darth Admin
Joined: 23 May 2006
Posts: 2527
Location: Mudway, Kent
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| Posted: Tue Jun 30, 2009 9:02 pm Post subject: |
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| MostlyMonki wrote: | | the earth or the relay goes back to the ecu iirc.... the earth on the pump might be worth a look though |
Correct, the ECU always grounds the "whatever" on the other end.
So check the 12V supplied to the relay and pump along with the ECU ground connection & of course the pump ground.
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The advice you receive on here is worth the paper it's written on.
Your experiences are worth shed loads to others, including the f'ups - live and learn.
Wouldn't YOU rather learn by someone else's mistakes? So would they.
'78 Bay, 2 litre 091 box, EJ20 NA & the ashtray's on the 'right' side.
I don't lean forward for hills any more 
Bugger, missed out on "Live fast, die young" |
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BlackCosmos
Padawan
Joined: 01 Jun 2009
Posts: 94
Location: essex
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| Posted: Wed Jul 01, 2009 8:29 am Post subject: |
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| had the electrics checked yesterday and beenn given the all clear,no earth faults etc..probably gonna have subaru diagnostics.. |
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MostlyMonki
Jedi Master
Joined: 09 May 2007
Posts: 419
Location: Bristol
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| Posted: Wed Jul 01, 2009 9:30 am Post subject: |
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| BlackCosmos wrote: | | had the electrics checked yesterday and beenn given the all clear,no earth faults etc..probably gonna have subaru diagnostics.. |
yeah but where the electrics checked while the car was actually moving? if its a fault caused by vibration youd be none the wizer.
what years the engine? if its pre 97 then subaru diagnostics via the ecu will just check the fault codes in exactly the same manner that you could do yourself with the check-engine light.... and i'd be amazed if they pick up on any electrical fault not caused by a faulty sensor.
might be worth checking the pump itself by hooking up a wire directly from the battery + to the pump +, and battery - to pump -, then see if it runs without interruption.... if it does then you've deffinately got a loose wire/dodgy relay somewhere.
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BlackCosmos
Padawan
Joined: 01 Jun 2009
Posts: 94
Location: essex
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| Posted: Wed Jul 01, 2009 12:55 pm Post subject: |
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| have bypassed relay so fuel pump ran constant and still had the problem..it does improve once the engines at operating temp..becomes drivable.. |
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BlackCosmos
Padawan
Joined: 01 Jun 2009
Posts: 94
Location: essex
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| Posted: Mon Jul 06, 2009 7:58 am Post subject: |
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| have checked relays,its not that..definately seems to improve when engines hot..clicks fuel pump relay consistently when cold..any ideas?? |
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