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Whats Wrong with my fuel pump?
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nygiants49
New User
Aug 1, 2017, 12:09 PM
Post #1 of 7
(1379 views)
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Whats Wrong with my fuel pump?
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My car is a 2002 Toyota Avalon with about 250,000 miles. I replaced the fuel pump about a year ago, and the replacement lasted for about a week before it gave out too. I assumed it was defective and replaced it again. Since then, the car has been hard to start unless it is warm and has been running for about 15 minutes. I replaced the IAC valve at about the same time and have cleaned it several times. The fuel pump gave out again recently and when I tested it with a multimeter, I found neither of the wires leading to the pump are getting power when the ignition is on. When i try to start it the voltage on one wire jumps from zero to 8.5, then up to 11 or 12 for about a second when i release the key, then back down to zero. The fuel pump relay and fuses are all good. I checked the fuel pump and it isn't pumping even when it gets power so i am replacing it, but what could cause the voltage differences, and could that be causing the hard start? No codes or lights are on
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 1, 2017, 1:49 PM
Post #2 of 7
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Re: Whats Wrong with my fuel pump?
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Not sure quite how you are checking for power/voltage to get those readings. IDK - for now I'd look hard at wires, connections at pump and any along the way first. Remember it's not supposed to stay on with key in just run or when pressure has built up in just seconds so need to catch that,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 1, 2017, 3:07 PM
Post #3 of 7
(1357 views)
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Re: Whats Wrong with my fuel pump?
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Because the fuel pump only powers for 2 seconds when the key is first turned on. It does not remain hot unless the engine is cranking or running.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
Veteran
/ Moderator
Aug 1, 2017, 6:34 PM
Post #4 of 7
(1345 views)
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Re: Whats Wrong with my fuel pump?
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You may have something going on with the wiring....HT already pointed out the 2 second koeo cycle..... If you are using Airtex pumps.....well,,,,that's probably your whole problem right there...
You may have something else going on....but with any diag problem....fix the broken stuff 1st and see if it makes a difference....
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 1, 2017, 6:36 PM
Post #5 of 7
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Re: Whats Wrong with my fuel pump?
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Hey, I have been using Airtex pump for years with very little problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 1, 2017, 6:46 PM
Post #7 of 7
(1331 views)
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Re: Whats Wrong with my fuel pump?
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I've had better luck with them than Delco.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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