Question about 2003 Jeep Wrangler

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How many amps does the fuel pump on a 2003 jeep wrangler draw and what should the relay be rated at

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  • wallygator67 Feb 05, 2010

    I know that. I'm using a relay from a parts store and it is only rated at 20 amps. The oem one that I took out does not have any rating on it. and I'm just trying to figure out if the aftermarket one might have been too light. I work at a parts store and with mechanics all the time. I have had a few tell me the problem could be just a faulty relay but am planning on checking the wiring and fuel pressure on my next days off. It's just wierd that as soon as i switch the relay it fires up again right away and will run for weeks without problem. Thats why the real mechanics i talk to are leaning toward wiring. figure a broke wire somewhere might be shorting.

  • Richard Scordino May 11, 2010

    It's possible that I may qualify as a "real mechanic" having spent over thirty years in the business and building 7,000hp top fuel engines, but then I only had to design those systems not just change parts!!!! I'd look for a pump that is beginning to bind up or a bad body ground, both of which are causes for a higher power demand. If you work in a parts store, you know that parts even from the aftermarket need to conform to OEM specifications or they can't work. Jeep uses pretty much the same relay for several different systems. They are rated at the vehicles operating parameters and aside from a failed voltage regulator causing voltage to run wild, the only reason for excessive draw is a bad ground or a component served by the relay that is binding and pulling too much power. I stood next to an artist once but that does not make me an artist.

  • Richard Scordino May 11, 2010

    Better question but still going in the wrong direction....Your relay is not "multiple choice" it is not available in different ratings, but, is designed to work with the components in the vehicle. The amperage draw of the pump will vary depending upon the condition of the grounds and the load placed upon it. To test a fuel pump, you need to check the output pressure at the fuel rail and ensure that the supply voltage is good. You also need to make sure that you not only have pressure at the rail but that the injectors are permitting fuel to enter the engine (controlled by the crank sensor, tps and map sensor as well as the temperature sender as well as the auto shutdown relay) Two most common system problems is a bad pump that overheats and stops working, then works again once cool and a failed crank sensor that causes the injectors to not open. Again, a manual and good test procedures are the only way to check these items with any accuracy. Of course, you need to actually know and understand what I've written (which obviously you don't) so I'll post this as a "clarification" so you can't rate it as unhelpful again!



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A top fuel engine isn't your backyard "hot rod" (block alone is worth more than three of whatever you are driving)
And, I ran several shops that all boasted a less than 2% "come-back" rate with regards to not having fixed the problem the first time. (try and find a shop that can say that)

Posted on Feb 06, 2010

  • Richard Scordino Feb 07, 2010

    Here's an idea for you...Find an 80 amp relay and install it...that way when the system draws too much instead of burning the relay you can fry the entire electrical system right back to the computer.
    Don't dare actually change the pump though!



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