Question about Chevrolet Suburban 1500

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Harness colors don't match new colors to chng fuel pump connector

1999 Suburban harness colors don't match described colors for changing fuel pump connector module from Metripack 150 to GT280. Have gray, 2 black, and 1 purple, but need gray, black, org/blk, purple.
Is the larger diameter black the real black and other one just missed its orange stripe?

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I know what you are talking about, last time i looked at the wires on the pigtail i cut off and i determined which color went to each pin location. then transfered my findings to the new pigtail.

Posted on Nov 17, 2009

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2004 buick centry.how do i hook up new fuel pump.with new wire connector? Im not sure how to hook the new plug up.


Are the wires on the new fuel pump connector color coded? Can you match up the wire colors? If not color coded, can you go abcd on the wiring connector? Compare one connector to the other.


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Nov 09, 2015 | Buick Cars & Trucks

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Working on the fuel pump wiring harness for 1999 isuzu rodeo the colors are not matching up with the vehicle wiring harness. delphi fuel pump wiring harness colors are 1. gray 2.purple 3. black 4.blac


USA car?
where are your hands, now.
where is this harness. at , EXACTLY?
my guess , new fuel pump and is the wrong pump?
finding Isuzu parts in USA is hard. after thier departure.
also on allcars pump vary by engine options.
so no engine stated. so cant help much at all.

but if in usa and if your engine is listed here.
here are all the pumps made after market here. in USA
fixing cars is easy
finding good parts is very hard, and takes skill.

gas engines not diesel.
3.6L shown.
https://www.rockauto.com/catalog/x,carcode,1355857,parttype,6256

are you replacing the whole assemblY ? it just a connector on top of rack , no pig tails
but are you replacing the pump ON THE RACK
that different and lots harder.

do say.

Feb 08, 2015 | 1999 Isuzu Rodeo

1 Answer

What is pigtail wiring harness for 1999 gmc suburban


PIGTAIL WIRING HARNESS CAN BE ANY OF SEVERAL WIRING HARNESSES ON A VEHICLE.IT MEANS THE WIRES WITHIN THE HARNESS EXIT OR TERMINATE WITH A CONNECTOR AT THE END OF THAT PARTICULAR CIRCIUT OF SAID HARNESS.

Oct 10, 2012 | 1999 GMC Suburban

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My aunts 1997 Jimmy was towed to my Dads .Cranks but no start,after batt. charged. They had been hitting bottom of fuel tank,and would start.But not anymore . Dad replaced pump.Had to rewire connectors for...


I would recommend checking the "re-wire job and make sure it is done correctly. Many GMs have had problems with the connectors at the fuel pumps. The fuel pump manufacturers have re-designed the connector to correct the problems they have been having. This is WHY the re-wire is required. The fuel pump kits usually come with the new connector to complete the job. However, some of the kits have wire colors that do not match the wire colors on the vehicle harness, Some of them also have "duplicate" colors, like two black wires. One will be a larger gauge than the other one. I had a couple where the white wire on the new connector had to be wired to the purple wire on the vehicle harness, etc. If your dad did not follow the directions EXACTLY then this could be the cause of your problem. (The pump MAY be running backwards)

Aug 03, 2011 | 1997 GMC Jimmy

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I have a 1999 gmc 1500 with fuel module problems there are 2 pumps and i have the other pump. the differance looks like 1 of the plugs on top. i have the plug i would like to make work. they are both 4...


hi, if you bought a new fuel pump assembly you are one of many who had problems with the connectors. so your not alone. the fuel pump manufacturers changed the plug configuration to solve a problem with the existing plug, the plug being replaced is the square plug on the left. the new pump assembly came with the new pigtail and you need to cut off the connector(close to the plug so you have enough wire) and ****-connect the new plug onto the trucks wires. the wires will be color coded to match the old wires, they maybe dirty and oily so you will probably have to clean them to tell the difference. also the pump should come with a diagram to help solve the wire problem.

May 18, 2010 | 1999 GMC Sierra

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1999 suburban starting issues. fuel gauge acts crazy, could it be grounding problems?


fuel pump assembly in gas tank. comes with new connector. should take care of it all

Apr 22, 2010 | 1999 Chevrolet Suburban

1 Answer

What wire is the power for the fuel pump at the pump


there were some production changes in 1998 to the fuel pump wiring, so the connector can have 2 diff fuel pump power wire colors, the most common color is grey, but the the harness at the tank has just 4 wires, the larger wires at the four wire oval connector are the fuel pump 12 Volt and the other is the ground, it is black, the other 2 wires are the sending unit, also the connectors ( Chevy factory service bulletin) on this year had a problem with burning, so if you get a new fuel pump always replace the 4 wire fuel pump connector. I have attreached a picture of the connector
2ea264c.jpg

Jun 30, 2009 | 1998 Chevrolet C1500

1 Answer

2001 Chevrolet Impala 3.8 fuel pump wiring diagram


The wires should be grey, orange and black, purple, and a black wire. The purple goes to purple, grey to gray. The orange and black goes to the small black wire on your car harness and the black goes to the bigger black.

Apr 30, 2009 | 2001 Chevrolet Impala

2 Answers

99 suburban wont start sometimes


I had a similar ongoing problem with my 1999 GMC Suburban C1500, it occurred only in the hottest days of the Texas summer. In addition to not starting, the truck sometimes exhibited symptoms of misfiring while driving at highway speeds, as if the engine seized or as if there no fuel being delivered to fire.
I found a small garage mechanic who swore he could fix it after years of taking it to the dealer and other franchise repair shops and getting the same answer "we can't find anything it like you described, it won't do it while we're testing it, bring it in right away so we can get the history codes....blah, blah, blah". I always thought it was due to an intermittent electrical grounding issue. Anyway, long story short, the small garage mechanic was guessing a lot of the time, but after changing the fuel pump, the sending unit, fuel injection system and many return trips to the garage with me saying 'that wasn't it, it's still doing it" it finally turned out to be a faulty wiring connector link in the harness assembly ABOVE the FUEL TANK that came from the pump or sending unit. When it got hot the link would melt and create a short, when it cooled a bit it would still conduct. We replaced the wiring connector and 4 years worth of unexplainable intermittent starting problems disappeared. I spent $2K to $3K over the years, when it finally turned out to be a hidden $12 wiring connector.

Good Luck.

Jan 01, 2009 | 1999 GMC Suburban

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