Question about 1993 Chevrolet S-10 Blazer

1 Answer

Fuel pump irregularity

Hi,

I replaced a fuel pump and the new one is acting odd. Instead of the steady whine I hear from most fuel pumps, this one will chug and surge. You can always hear it when you first push the gas pedal. It goes about a mile down the road before it seems to stop pumping gas and the vehicle slows down to about 20 miles an hour, and the pump can still be heard chugging. If I restart it and let it prime, it'll go for another mile before doing it again. I replaced the fuel filter and that didn't help. I also replaced the sending unit when I replaced the fuel pump.

Posted by on

  • 1 more comment 
  • tbeltran Feb 08, 2009

    Yes, earlier this morning and it didn't help.

  • tbeltran Feb 08, 2009

    That's what I'm thinking. What is the pressure supposed to be at for this vehicle?

    Thanks


  • yadayada
    yadayada May 11, 2010

    DID U REPLACE THE FUEL FILTER?

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 31 Answers

Sounds to me like you got a faulty pump. To be sure, put a fuel pressure gauge on the engine and see if the pressure drops.

Posted on Feb 08, 2009

  • Chris Iarocci Feb 09, 2009

    If you have TBI (throttle body injection), you should have 9-13 PSI constant pressure. If your truck has multi port injection, then the fuel pressure will go up and down with the change in manifold pressure. It will be lowest at idle, and highest at wide open throttle. The max pressure should be around 55-61PSI, and lowest at idle (in the 20-30PSI range at idle). In any event, if you push the throttle down and the pressure drops, it is wrong.

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why do i hear my fuel pump on a 2004 pontiac bonneville whining up and down?


Walt, You will hear the fuel pump at times. When you take the gas cap off the fuel tank is acting somewhat as an echo chamber that is amplifying the noise of the fuel pump. Presumably the engine is ticking over when you remove the gas cap? Otherwise the fuel pump should not be running.

The fuel pump only supplies fuel on demand - obviously. The pump will run to pressurise the system to meet demand and if that demand for fuel fluctuates, the pump will run down or increase speed accordingly. This speeding up and running down of the pump is constant.

If by 'a miss' you mean that the fuel pump goes quiet for a second or so - that's normal. No demand for fuel - the pump doesn't run. That wouldn't effect the engine at tickover.

If the 'miss' is from the engine at tickover that's more than likely to be a plug.

If your car runs okay at speed and doesn't cut out and then will restart almost immediately, it sounds as though your fuel pump is okay.

Mar 21, 2016 | 2004 Pontiac Bonneville

1 Answer

Problem starting


When you turn the key to on before start do you hear the fuel pump whine for a few seconds? If you hear the whine it could be fuel filter or no spark. If no whine squirt gas into throttle. Then start the car if it starts the problem is in fuel delivery (bad fuel filter, fuel pump or fuel pump fuse). If it did not start then its spark related(cam or crankshaft sensor, ignition coil)

Dec 25, 2013 | 2001 Ford Escape

1 Answer

Will not start seems to have plenty of battery. however it will not turn over.


Check for spark. If no spark it can be the cam or crank shaft position sensors. Turn key to on do you hear the fuel pump whine for a second or two. If you hear the pump it could be clogged fuel filter. If you dont hear whine check fuse then check for voltage at fuel pump. If volts at fuel pump then it could be the pump.

Dec 24, 2013 | 2011 Ford Escape

2 Answers

2002 cavalier was running fine then just died. Will start but wont stay running. Fuel pump?


12.72 is what some new batteries have for a week or so
Little high
Only you know how old the battery is,4 years & it may
be bad,happens,& the voltage can go up when bad,oddly

If your into the fuel pump thing,put a pressure gauge on it
Don't guess. Can't hear pressure build.

Sep 29, 2012 | 2002 Chevrolet Cavalier Coupe

1 Answer

Vehicle will not start, normally when ignition is in on position there is a whining noise for a few seconds, I wait until the whining stops and then start the vehicle. Now, when ignition is on on position...


Hi. The whining noise you hear is the fuel pump priming the fuel lines. If you don't hear the sound anymore then your fuel pump has stopped working. Check your fuses. Also look for a relay for the fuel pump. The relay will usually be in a large box under the hook that says fuse and relay panel or something similar. If the fuses and relay are working the the pump will probably need to be replaced.

Jun 12, 2011 | 1996 Ford Explorer

1 Answer

My 2001 saturn s series car died on me a couple months ago, i thought it had simply ran out of gas, so i put more gas in it to try to restart it, i found that it will fire, but not start, i could not hear...


Hi :) That starting system has a coil pack and if one side stops working the engine only fire on 1-3 or 2-4 which make the engine shake and not start.There should be a crank senor that could be on its way out. and check the relays in the black box buy the battery there is one for the fuel pump and pre start pump.

Apr 14, 2011 | 2001 Saturn S-Series

1 Answer

2000 grand am gt will not start. in previous days it was hard to start but once it was going there was no problem starting it the rest of the day. when you turn the key on you can hear the pump start but...


fuel pumps are a real common problem for these cars you can hear them run and they can still be bad because they leak the fuel pressure back into the tank instead of holding steady there is a test port under the hood on the fuel rail ontop of the intake there is a plastic cap on it and if you unscrew the cap it looks like valve steam in a tire hook up a fuel pressure tester there (you can borrow one from autozone or kragen for free) fuel pressure should be at least 50psi with the key in the on position and hold there steady if its less or if the pressure starts to drop replace the fuel pump

Sep 28, 2010 | 2000 Pontiac Grand Am GT

2 Answers

1994 chrysler lee baron fuel pump whining


You might try changing the fuel filter, most likely the fuel pump is going out and will need to be replaced.

May 13, 2010 | 1994 Chrysler LeBaron

2 Answers

Whining when i press gas


normally, the only part of your automatic transmission that will make a whining noise is the pump. it usually whines when iether the fluid is low or more commonly when the transmission oil filter is getting plugged up.

the power steering pump will also make a whining noise too.

turn the wheel all the way to the right and hold steady pressure against the stop. this puts maximum force on the power steering pump and, if the power steering pump is the one making the whine, it will change the sound of it. (usually louder).

if the trans pump is making the whine noise, it should sound different in neutral compared to drive. this test will really only work if it make the noise without the vehicle moving. if it wont do it at idle hold the rpms at 2000 or so.

if you decide the noise is coming from the transmission, and the transmission filter has not been replaced (assuming you installed a used transmission), replace the filter by removing the oil pan.



oh and also, if it is the power steering pump you should be able to make it make the whining noise while the vehicle is stationary. if it wont make noise unless its moving its not the power steering pump.

Mar 23, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Fuel Pump Problem?


lots of stuff in the fuel system can couse problem like pressure regulator, pressure switch,or relays. pump could be on way out though.

Mar 20, 2009 | 1998 Mercury Tracer

Not finding what you are looking for?
1993 Chevrolet S-10 Blazer Logo

Related Topics:

148 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

61037 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...