What should the fuel pressure be in a Chevy Tahoe?
When it is running, fuel pressure stays constant at 54 psi, but again once when shut off it bleeds off down to 30 psi. I have read that the fuel pressure needs to stay within 5 psi for 5 minutes or there is a leaky injector or a fuel pump check valve.
When do I lose fuel pressure on my Silverado?
I have a 2005 Chevy Silverado 1500 and I lose pressure gradually when I shut off the engine. When I go back to start it within an hour I cant get it to fire unless its turned over several times and I hit the gas. Ive replaced the fuel pressure regulator and ICV. No codes whats so ever.
When does fuel pressure drop after turning off the engine?
Turn the engine off, but key on and pressure gradually drops all the way to 18 PSI over 20 minutes. Turn the key off then key on but no engine start, I can hear the 2 second fuel prime and the PSI shoots up to 55 PSI and engine still has to turn over for 3 or 4 seconds without gas pedal, 1 or 2 seconds with gas pedal.
How much psi do I need for the 4.3 injector?
Ive had a lot of experience with the 4.3 on previous vehicles I owned and they need at least 58 psi to start. Early versions of the injectors were prone with sticking poppets and leaking regulators. Hell, back in the day when my 94 Jimmy was still under warranty GM changed the injector 3 times.
What should the fuel pressure be on a GM 4.3L?
This is where you’ll connect your fuel pressure gauge (the first photo, in the image viewer, is of a 4.3L, and the second of the V8 engine). NOTE: In case you’re wondering, the factory manual specifies that the fuel pressure for the CSFI system should be between 56-62 PSI. The CPI system’s fuel pressure should be between 60-66 PSI.
How to test fuel pressure on a Chevy S10?
Here is how to perform a pressure test at the fuel rail. This test can be done to diagnose a number of things. Bad fuel pump, injectors, fuel lines, etc. I did this test on my 2.2 Chevy S10, but this will be the same with any vehicle with a valve already installed from the factory. https://www.amazon.com/gp/product/B00…
What should the fuel pump pressure be to start the engine?
The fuel pump produces much more than just 50 PSI of course but the bare minimum the engine needs to start is 50 PSI. Anything less and it will crank for ever before it starts or not start at all. So, the very first thing you need to do is to verify that the fuel pump is delivering at least 50 PSI of fuel pressure while the engine is cranking.
What are the symptoms of a bad fuel pump?
Symptoms Of A Bad Fuel Pump. Where To Buy The Fuel Pump And Save. TEST 1: Using Starting Fluid. TEST 2: Fuel Pressure Test With Gauge. Which And Where To Buy A Fuel Pressure Gauge. More GM 4.3L, 5.0L, 5.7L Tutorials. You can find this tutorial in Spanish here: Cómo Verificar La Bomba de Combustible en Los Sistemas TBI (at: autotecnico-online.com ).