I ended up having to change the fuel pressure regulator. I had the same problem, I changed the pump and it worked for a while like a week, I lost fuel pressure even though my pump was working. Could it be that after all this cranking and no start, the spark plugs are so saturated with gas that it won't ignite at all? I have run every cleaner known to man. I could see it not starting up, but I'd at least expect it to hit on a cylinder every now and then. If the switch tests good, connectors and wires have a habit of going bad for no particular reason. That black cover is the fuse for the fuel pump.
If not, I'd look for a stretched timing chain causing jumped timing low compression. My ideas all lead to the same road of bonked injectors spacifically something to do with heat soak and blah blah blah. No starts are usually gas or spark related. I am not talking about the screen in the tank, but the inline fuel filter that is mounted on the frame under the driverside of the truck. Since I had not touched the distributor, I discounted that and decided that it must not have that much of a vacuum leak if any. Take a look at it and make sure it's not blown. Please or to join the conversation.
Now try to see if the pump is running and if fuel is being delivered to the injectors. While the gauge is on. When it runs for the 2 seconds it is burning off the starter fluid only, which means it probably isn't actually getting fuel into the chamber. Good idea to replace them occasionally. Either way, you need to check for spark. The fuel pump is normally energized in two different ways. Depending on where you checked fuel flow, it may not have enough pressure to spray through injectors.
Oct 25, 2010 Have you checked the fuel pressure? If you wait till it won't start to change the filter its to late,unless you put in backwards. When you first turn key to run the fuel pump runs for 2 seconds. That should be all you have to do to make things work Good luck. I had a similar problem with an '87 Suburban. Only the 2500 and 3500 models were equipped with the 7. Now if this isn't happening than something is wrong and you need to run another diagnostic on it, it will help with the process of elimination. Did you tune it up? I have an 88 gmc I'm swapping a 91 silverado wire harness into, so I'm about to get real familiar with all this.
Then when you try to start it, it drops from 55psi to 50psi but still doesn't start. Only thing I know of to check is the ignition module. The 1988 Chevy Silverado had four engine options: 210-horsepower hp 5-liter or 5. This is the next step. I replaced all faulty or worn electrical connections as well and put in a new Higher-End Bosch alternator to boot. You first need to make sure that you have a spark at the plug wire where it snaps onto the plug. I've already replaced both the cam and crank sensors, new fuel pump and filter as of 3 months ago, and new wires and plugs as of 2 months ago.
If it has a spark, fuel, and is turning over but not starting, you have to consider these things. The last time I did one was at 80,000 miles and now I have 170,000 miles. I have had 3 diagnostic run and it won't show a code, so guys I decided I would take the dist. Any help would be appreciated. Jul 01, 2011 First spray starting fluid in the air filter.
Check the wires going to the oil pressure sending unit. Basically a capisator in the computer melts down like an old battery and slowly wipes out more and more as it spreads. Replaced the ignition switch and it did not fix the problem! I have taken the main fuel line to carbs off and when key is on no fuel movement. I'm sure this topic has been posted before, I just didn't have the time to browse all of them. It should be over 35psi. Open the butterfly and look in.
Id try checking all your fuel hoses and possibly fuel filter. I'm about at my end here, i can't get this thing running. If it runs for a few seconds after spraying starting fluid in you know you have a fuel delivery problem. Ok so we got a fuel pressure gauge and this is what happened. If it won't start at all now, you will have to figure out if it is a lack of fuel to the injectors or lack of spark to the plugs, or something else. Now it won't start, it turns over, i smell gas fumes, but nothing. If it don't but it does have some pressure then you need to replace the fuel pump in the fuel tank.