Fuel Pump or something else?
dbondy
02-14-2011, 11:45 PM
Just had a new fuel pump put on 2005 buick century... the problem was that it was hard to get the car to start..one day it just didnt even turn over...got a new fuel pump.... NOW--- after getting the car back from the mechanic it is still very difficult to start it..i have to press the gas when i turn the key in order to get it to start.... but if i turn the engine off and then leave it for like 2 minutes it will start right up with no problem...if i leave the car sit for an hour it will have trouble starting... did they get something in the gas when they were repairing the fuel pump..whats happening???? help
GTP Dad
02-15-2011, 08:07 PM
Welcome to AF!!
First of all did you change the fuel filter when you changed the fuel pump? Second, on the fuel rail there is a fitting to check the fuel pressure. Rent a fuel pressure gauge and check the fuel pressure. Your problem sounds like you have a leaking fuel pressure regulator that is causing your problem. When you let it sit for a period of time the fuel pressure is dropping too low and it takes time for the pressure to build up to a point where the injectors have enough fuel pressure to work. The pressure should be at least 45 psi with the engine off. With the pump running you should get at least 60 psi. If you don't get these figures at a minimum change the fuel pressure regulator and you should see a significant difference.
First of all did you change the fuel filter when you changed the fuel pump? Second, on the fuel rail there is a fitting to check the fuel pressure. Rent a fuel pressure gauge and check the fuel pressure. Your problem sounds like you have a leaking fuel pressure regulator that is causing your problem. When you let it sit for a period of time the fuel pressure is dropping too low and it takes time for the pressure to build up to a point where the injectors have enough fuel pressure to work. The pressure should be at least 45 psi with the engine off. With the pump running you should get at least 60 psi. If you don't get these figures at a minimum change the fuel pressure regulator and you should see a significant difference.
dbondy
02-15-2011, 09:21 PM
how much would this cost at a repair shop?
dbondy
02-15-2011, 09:53 PM
do you think i got screwed and didnt need a fuel pump...they did say that the fuel pump got burned out.... i was running on empty a lot... maybe that caused it?
danielsatur
02-15-2011, 09:57 PM
Symptoms of a cold hard start is usually a bad, or dirty Massive Air Flow (MAF) sensor.
dbondy
02-15-2011, 10:01 PM
so you dont think its a bad fuel pressure regulator?
danielsatur
02-15-2011, 10:06 PM
There's a test for the fuel pressure, and the electric fuel pump.
dbondy
02-15-2011, 10:11 PM
i got a new fuel pump... so the fact that the car is hard to start..but after i get it started it runs fine.... so i am either looking at a bad fuel regulator or a map flow sensor? how much should i expect to pay at a repair shop for either of these?
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