Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Fuel Pump not priming - Main Relay?

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Old Jun 11, 2005 | 01:09 PM
  #1  
rentacop's Avatar
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From: chase, md, usa
Default Fuel Pump not priming - Main Relay?

For reference: The car is a bone stock 92 CX hatch, 93k miles

Sometimes when i turn the key, the fuel pump wont prime, it seems like its more common when it's hot out. The car will start, then just cut right back off, is this a typical symptom of a bad main relay? Also, it seems to be more common when im low on gas. Well, it did it a lot yesterday and after i got gas it hasnt really done it, i think.
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Old Jun 11, 2005 | 06:30 PM
  #2  
Lord Helmet's Avatar
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Default Re: Fuel Pump not priming - Main Relay? (rentacop)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rentacop &raquo;</TD></TR><TR><TD CLASS="quote">For reference: The car is a bone stock 92 CX hatch, 93k miles

Sometimes when i turn the key, the fuel pump wont prime, it seems like its more common when it's hot out. The car will start, then just cut right back off, is this a typical symptom of a bad main relay? Also, it seems to be more common when im low on gas. Well, it did it a lot yesterday and after i got gas it hasnt really done it, i think.</TD></TR></TABLE>

Have you tested the fuel relay yet? To see if it's working or not?
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Old Jun 11, 2005 | 06:35 PM
  #3  
Setsuna F Seiei's Avatar
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From: Chicongoland area, IL
Default Re: Fuel Pump not priming - Main Relay? (rentacop)

Could be. Honda main relays are dula relays. The first relay powers up the computer and supplies power for the second relay. Once the computer is powered up, it will ground the second relay, which supplies power to the fuel pump. Main relays usually goes out when u leave your car under the sun when its real hot out.
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Old Jun 15, 2005 | 08:31 AM
  #4  
rentacop's Avatar
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From: chase, md, usa
Default Re: Fuel Pump not priming - Main Relay? (Lord Helmet)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lord Helmet &raquo;</TD></TR><TR><TD CLASS="quote">Have you tested the fuel relay yet? To see if it's working or not? </TD></TR></TABLE>Does the fuel pump have its own relay? IF so then i suppose i'd replace that first before messing with the main relay
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Old Jun 15, 2005 | 08:40 AM
  #5  
Crasian's Avatar
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Default Re: Fuel Pump not priming - Main Relay? (rentacop)

re solder your main relay, mine did the same thing, so did my dads accord and my brothers civic, easy fix
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Old Jun 15, 2005 | 09:33 AM
  #6  
Relic1's Avatar
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From: chicago burbs, Il, USA
Default

how to fix the main relay...

http://www.markl.f9.co.uk/howt...y.htm
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Old Jun 15, 2005 | 10:17 AM
  #7  
solareclipseauto's Avatar
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Default Re: (Relic1)

yeah real easy to fix the main fuel relay, seams thats what the problem is.
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Old Jun 15, 2005 | 10:17 AM
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From: mesquite, tx
Default Re: (Relic1)

if you replace the main relay and the same thing happens the i would change the fuel pump to anf filter
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Old Jun 15, 2005 | 07:33 PM
  #9  
rentacop's Avatar
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From: chase, md, usa
Default Re: (MONSTERZC)

I thought about that, but its purely electrical, because once the car actually starts nothing else happens, as far as power loss or stuttering, so it must be a relay. Thanks though.

And thanks Relic for the link.
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Old Jun 15, 2005 | 07:39 PM
  #10  
civicseth's Avatar
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From: Louisville, KY, USA
Default

I've got a main relay I would sell you if you need it. It came out of a 94 civic.
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