Fuel pump

When the pumps were replaced did the shop also replace the connector pigtail? If not low voltage to the pump may be causing problems. It is a common problem and most of the pumps come with the new connectors.

It could also be a bad regulator that is failing.

What does the fuel pressure read with the key on engine off? How about with the engine running? When you shut off the engine what does the fuel pressure do?

I'm guessing the pig tail was replaced... The mechanic I had claimed he replaced a lot of wiring.

As far as the pressure with the key off, I'm not sure. When it idled it was at 45 psi... and when it was starting it dropped to 25 psi. Didn't say what happened when he shut it off either.

I had another mechanic look at it.. and he ended up changing out the wiring harness... seems to help so far.

45 PSI is WAY low. You should see 55-65 key on engine off and at least 55-56 running PSI. I would have them test for a faulty regulator. Sounds like either the regulator is bad or you have a fuel leak in the manifold. What mileage have you been getting?

2002 Chevy Blazer Four Wheel Drive Automatic

What is the color of the ground wire for my trucks Fuel pump?. I need to check the gound and see it thare is a break in the line some whare

The black wire is the ground also see below

The wire color for the ground is black. The gray wire is voltage to the pump.

My blazer been running little rough.i put new plug in and new rotor and rotor cap new plugs wires.that did not help.so then i went to check my fuel pressure.with key on pump running psi 62 with pump off psi 56 with car running 56 psi.get car about 2000 rpm psi about 60.plz help thanks matthew

fuel pressure seems ok, scan for codes and check for vacuum leaks.

i check for links and did not find any and there is no codes

i forgot to till you this.when i come to a stop and and then i take off car accl really slow.i really can not pass a car right now because i can't get up to speed fast enougth

check fuel pressure again with a gauge auto parts rent it . if it stays below 60 replace the pump and check for a bad regulator. start car with gauge on, open throttle quickly it should go up to 66 psi if not replace pump and filter. check vacuum at idle at manifold if 15" or below suspect clogged exhaust.

Will a fuel pump for a 1999 Jimmy/two door fit my vehicle listed above? it is a four door.

i check fuel pressure and it was 62 psi as soon pump went off it drop to about 56 psi.i talk to my friends dad he a chevy expret and he said fule pump psi should be 60 to 66 psi.with car running it should be about 62 psi.so he said fuel pump is bad

Yes will fit like a glove GMC Jimmy and Chevrolet Blazer are identical part wise Chevrolet makes GMC, just different make and model. And only being a year difference you will not have any problems.

ok i had my car look at by 3 shops this week.and they all said i need a new fuel pump.i get new pump put in and still getting low fuel pressure 62 psi with key on soon pump goes off it drops to 56 psi.with car running at idle it's around 56 psi.i did a link down test and in 30 mins psi was still at 56.i really don't know where to start now.

Cool.Thanks

try the regulator it will either be inside or outside of intake.

i done a leak down test today psi was 60 and 10 mins it was 52 psi and i let it set 10 more mins it went from 52 psi to 44 psi

i have a 1998 chevy blazer but i cannot get power to the fuel pump

Did you check all the fuses a nd relay?

at idle psi 54

check the relay in the underhood elec center.

have you check ed regulator at all after I said that, your drop down is ok on pressure when shut off. I cannot see this and have no further comments..........or suggestions.

I am trying to find out the correct order to attach the fuel lines to my new fuel pump.

No real order, they should only fit on one way as the connections are different sizes.
There will be the fuel return line (small line on one side), the fuel pressure line (largest line on the other side) and the vapor line in the middle. The image attached shows the lines. Do not forget or ignore changing to connector pigtail that connects to the white connector in the picture. Those are a big failure item on replacement pumps because they get hot and the pins do not connect very well. Then you think the new pump is bad when it is just the bad connector.

My 1997 Chevy Blazer has a new battery and something is draining it i can hook up battery cables to it and its just fine. I just put a new fuel pump in about 3years ago. When i turn the key on i can not hear my fuel pump. I can pour gas in the throttle body and it will run untill that gas is gone. Then today i went to start it and it started without putting gas in the throttle body just for about 10sec. Please Help!!!!

it sounds alot like the fuel pump went again.... i believe the fuel pump is not part of the sending unit on those, so it shouldnt be to expensive, and its a fairly easy job that can be done in a driveway.

Does it have anything to do with the ignition switch? Ive heard that i need to replace it? and what color is the wire that goes to the fuel pump to test it?

easy way to tell if its in the ignition switch is to simply turn it on... does the radio turn on, and does the instrument panel have all the lights in it light up??? (check engine, abs, brake, etc) if so, its not in the ignition.... as far as which wire it is to the pump, without dropping the tank, you wont beable to gain access to the harness, so u might as well just drop the tank, remove the ring holding the sending unit into the tank, and remove it.... make sure you have a drain pan handy, and a blow gun.... turn the sending unit/fuel pump assembly upside down, drain all the gas from it... use the blow gun to blow off residual.... take it atleast 15 ft from the tank, and on the fuel pump it self,there will be 2 studs on the pump.... put ground to one, power the other.... doesnt matter which way, as long as u dont run it dry for an extended period of time... one way will pump, one way will push... if u have any movement from the pump, u will feel it spin fast.... try it a few times, if every time it works, then the pump is good.... most likely the pump is bad, and needs replacement... if this happens, make sure u get the right pump.... there are 2 different models... where the bottom mounts to the sending unit, it sits in a rubber grommet... if the shape is a tear shape, its one design, if its shaped like a D, its the other.... make sure you know which one u have before you buy the pump...

We are droppin the tank today..But Now what about my battery? whats draining it? im really confused on how to check all the fueses?

i would like to know if i have a bad fuel pump because my blazer stalled out at a few red lights and there is a noise coming from the back.

Fuel pumps are either good or bad. They work or they do not work--there is no in between. Sometimes they get weak, but almost always it is something like a blocked up fuel filter or a rotted fuel line sucking air in that causes the fuel pump to work harder and eventually fail. If your engine started up chances are it is not the fuel pump--check the other things I mentioned.

another thing. how do i take the lines off the tank we have it down but is a lil worried about taken the lines off. do we take it off from the tank?

Fuel pumps make a noise but it is usually a low buzzing sound.
You can buy or better yet rent a fuel pressure tester at most auto parts stores. Pressure usually should run 40 to 45 pounds at fuel rail.

remove the fuel lines from the sending unit on top of the tank... you may need a quick disconnect tool that can be picked up at any parts store... as whats draining the battery, when it comes to electrical, that can get pretty tedious... does it have any aftermarket parts that where hooked up to a constant power???

For some reason your style fuel pump are usually loud--yes like a--low loud buzz. If the noise does not sound like s buzz or hum then it may be the exaust system vibrating in a hanger back by the fuel tank.

The fuel system on your vehicle DOES NOT have a fuel rail. It has a CPI system. There is a fuel pressure test port that looks like the stem on a tire. The pressure here should be between 60 and 66 PSI NOT between 40 and 45. If it is that low then the engine will almost not run. A CPI system needs a very high pressure to operate properly. Also, low fuel pressure usually means a blocked fuel filter or a rotted out gas line..Have your fuel system pressure checked...

ok well we got the gas tank down and we tried to jump the fuel pump but it didnt do anything ...so i guess we are going to have to get a new one...:( Theres nothing on there thats after market but a radio ...but the radio dont work ...

check the radio fuse... if its good, then its possible your wiring has been shorted out, and that could be causing your draw...

i have a 1996 chevy blazer i have to turn key on for a few seconds then crank over been starting fine until yesterday an today any ideas?

ok thanks so much for your help. we will be putting a new fuel pump in by the end of this week hopefully!!! Them things are not cheap $300. Now we just hope nothing else is wrong with it. but if there is ill be back on here to ask ya! so stay in touch!! Thanks so much again!!