Question about 2001 Chevrolet Suburban

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No power to new fuel pump

Install new pump swapped relay no power to plug at pump

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  • Chevrolet Master
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Were you cranking the engine over when checking for power at the pump?

Posted on Dec 31, 2012

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Posted on Jan 02, 2017

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Had front-end collision damage fixed and drove the 1997 grand caravan home; turned it off; and later it wouldn't start. Turns over ok, but not getting gas. I think it is the fuel pump relaty. There...


There is a relay for the fuel pump its controled by thhe ASD relay sure you plug a new relay or even swap it out with other relay in the distribution area but you need to make sure why you are not getting fuel check thhe fuel pump fuse is it open if it is replace it and does it blow easy now turn the key and cycle the switch you should hear the fuel pump humming if it doesnt go ahead find the relay take thhe relay cover out and expose the switch are and put it back in its socket key on or off if you collapse the realy to close thhe switch you should hear the fuel pump running if it doesnt you either have a failed fuel pump a bad connection or something not allowing the ASD to engage

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1 Answer

No power going the fuel pump on 1991 honda accord what should i do


If you have verified a no power condition by pulling the tank and measuring the power signal to the pump then either your fuel pump relay is bad, or you have a bad fuse, or a broken wire somewhere in between.

My guess is that the fuel pump no longer comes on when you turn the key to the on position and that you havent dropped the tank to inspect the pump yes? If this is so you may have a bad fuel pump as well. What I would do is check the fuses for the fuel pump and make sure they are not blown. Then I would check out the relay, visually inspect it, the top should come off of it, look for any burnt wire traces and components inside the relay, you may be surprised to find other relays in your car are the same as the fuel pump relay. Swap one of those out with the fuel pump relay and see if that fixes the problem, this will save you the money of buying a new relay before you know it is your problem. If the relay appears good then you may have to drop the tank and install a new pump. Some vehicles have harnesses under the hood which allow you to feed power directly to the fuel pump so you can test it to make sure it is good before you drop the tank. Some don't. You can feed power directly to the fuel pump by jumping the pins on the relay, I am not familiar with the pinout on your cars relay however and could not advise you which pins to jump to feed power directly to the pump. Get a chiltens or haynes manual, they should have wiring diagrams in them.

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2 Answers

2001 Will crank but wont start


Hi , these trucks are notorious for fuel pump issuse. (I have 2 in the shop now).First check for spark if spark is present then we need to check for fuel.if a presure gauge is avail,install the gauge and crank the engine.if presure increases to 50-60 psi fuek is probably not the issue. now if a gauge is not avail you can remove the air cleaner/snorkle assy.spray some carb cleaner in the throttle body,then try to start if (if it starts for a second the problem if fuel.now if it starts go under by the fuel tank,reach up (from the drivers side and unplug the fuel pump plug (4 wire) have some one crank the engine ande check for battery power on gray wire durring cranking,if battery power is present check black wire for good ground.if both power and grounds are present pump is no good.if now power then swap the fuel pump relay w/ same design relay (in the underhood relay center) relays are also a known issue w. the s and t trucks,good luck Thanks

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1 Answer

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The electric fuel pump will have to much pressure for the carb, you need a pressure regulator to cut the pressure down to 5 psi. The reason the fuel pump won't stay running is because it gets its power from the oil pressure sensor by the distributor. Did you install this on the new engine and plug it in? The relay is what runs the pump for 5 seconds and shuts off.

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1 Answer

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Check the fuel pump relay, you can swap the fuel pump relay with a similar one under the hood, swap it and check power again.

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