Question about 1991 Buick Century

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1991 buick century no start replaced fuel pump and harmonic pully sensor and plugs no start

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Have you checked for spark? Will it start if you spray carb cleaner in the intake?

Posted on May 16, 2009

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Remove plug wires at coils & have assistant crank engine,check for spark jumping between coils.If that's good.you may have an ECM concern.Check all fuses inside & underhood.hope this helps

Posted on May 16, 2009

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2001 Buick Century. Fuel gauge didn't work. I bought a new fuel pump with fuel level sensor on it, installed, car will not start. I replaced the fuel pump relay, put the OLD fuel pump back in with...


I had a Grand Prix one time (basically the same car) that had a problem with the fuel pump harness. This harness plugs into the top of the fuel pump as you know, and into the floorboard underneath the car. Check the floorboard end for corrosion or broken wires.

Aug 19, 2011 | 2001 Buick Century

1 Answer

Fuel pump need replacing 1991 Buick century, where can i find it?


I'm sorry to hear that. The fuel pump is in the fuel tank. Make certain that all the rest of the fuel system working before you have to drop the tank. 1.Fuel pump relay or any fuses.2.Replace fuel filter,(inline between tank ane pressure regulator). 3.Trace power and ground wires from tank back to relay looking for breaks or pinches. 4.Look for a pump reset switch. If all that is good, then replace the pump. Good luck.

Aug 08, 2010 | 1991 Buick Century

1 Answer

Crank sensor location on a 1991 3100 motor


1991 Buick Rivera only came with a 3.8L engine known as the 3800
The crank sensor is behind the Harmonic balancer / Crank pully. Special tool required to remove pully without damageing it. once pully is off the crank sensor is held inplace by 2 bolts.

Oct 15, 2009 | 1991 Buick Riviera

2 Answers

Car won't start Buick Lesabre 1998


Fuel pump is in tank, but ck the crankshaft sensor front of engine near pully for proper connection

May 28, 2009 | 2000 Buick LeSabre

1 Answer

Locate crank sensor on 1990 buick century


Hello, the crank position sensor or (CPS) censor is located directly behind the harmonic balancer (or fly wheel at the very bottom). The sensor is located on the right side of the harmonic balancer when facing the front of the motor. You must remove the harmonic balancer to replace the sensor. You must also re-align the sensor with 30 thousands of an inch tolorence, or your car may idle rough or may not start. I own a 1990 Buick Century and just replaced my CPS sensor last month. There is a trick I learned to reinstalling the new sensor. Let me know if you need that information.

Apr 06, 2009 | 1990 Buick Century

1 Answer

1991 Buick Century V/6


1991 buick fuel pump relay-kyxfwkajeudzeht3dcsgo1sm-4-0.gif

Instead of guessing you should learn to test , so you don't replace parts needlessly !

Fuel Pump Electrical Circuits Description and Operation
Do you know how to use a DVOM - digital volt ohm meter ?

Jul 18, 2017 | 1991 Buick Century

1 Answer

Starts fine, Idles fine, Drives Fine for a while


you might want to chk. the crank sensor and or cam sensor. sounds more to me that it could be fuel problem. chk. fuel pressure. pump could be on its way out. don't be fooled by hearing the pump running as they sound like they are pumping but there not, at least not enought pressure to keep it running. pressure should be around 50 p.s.i.

Jan 06, 2009 | 1990 Buick Century

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