Buy Now | Log In | ALLDATA Corporate Site | AutoZone.com
Back To Home Page
Log In To Your Subscription
Go To ALLDATA Back Home
Buy A Subscription! Back Home About ALLDATA Information View Sample Vehicles Read Testimonials Frequently Asked Questions Contact Us
Dowload Our Navigation Chart

Sign Up To Receive ALLDATAdiy.com Alerts

Click Here to receive regular product updates, special offers, and automotive news.

2012 Subaru Now Available May 2013: More 2012 Vehicles Added including Fiat!
• View New Vehicles
2012 Subaru Now Available December 2012: More 2012 Vehicles Added including Chevy & GMC!
• View New Vehicles
View All News and Updates:
• Go To News
Tech Tips
  Read All Tech Tips

ALLDATA Tech Articles Are Updated Weekly
• View All Tech Articles

  Dodge Durango: Brake Pulsation Problems In Paul's Durango
• Read Dodge Article
 
Fixing A Smelly Audi Audi Tech Tip: A4 begins to Smell caused by a Faulty Hose Composition
• Read Audi Article
Why Do You Need To Change Your Timing Belt? Why Replace Your Timing Belt
• Read Belt Article
Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
Home >> Featured Tech Articles >> Go Back
   
  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

Miscellaneous
Acura
Audi
Buick
Cadillac
Chevy
Chrysler

Dodge/Plymouth
Ford
GMC
Geo
Hyundai
Honda
Isuzu

Jeep
Lexus
Lincoln - Mercury
Mazda
Mercedes
Mitsubishi
Nissan
Oldsmobile
Pontiac
Saturn
Subaru
Toyota
Volkswagen
 
   
  Jim Grant's Tech Tips

Chevy Astro, Original Fuel Pump

Q: I own a ‘99 Chevy Astro van and one day it wouldn’t start. I’venoticed that the fuel pump sound was gone. I had the pump replaced with a genericpump,thenit started great. The next morning it wouldn’t. I checked everything, the fuelpump sounds ok. Someone told me that I need to install an original pump so Idid, but still the same thing... nothing!, What can I do now?

A: First, you have to find out if the vehicle has fuel pressure and enough of it. Check the fuel pressure at the test port of the fuel injection system, there should be 60 to 66 psi with the key on and the engine off. The injection system in your vehicle has 2 injectors for each cylinder. One injector is electronically controlled by the computer while the second injector responds to the fuel pressure received from the first. The electronically control injector is your basic electronically solenoid that opens a valve to allow fuel to flow. The second injector has what is called a poppet valve. Fuel pressure pushes a check ball back against spring pressure allowing the fuel to be sprayed into the intake port of the cylinder head. It takes a minimum of 40 psi of fuel pressure to push the check ball back. If you have less than 50 psi at the test port you’ll likely have starting problems. Original equipment or aftermarket they all have to do the same job.

 
     
Have any Questions About ALLDATAdiy.com? Please Email Us
Buy Now | Log In | About | Sample Vehicles | Testimonials | Join Affiliate Program