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2001 5.3l Hard Starting

hypergolic

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hypergolic Enthusiast

hypergolic

Posted
Posted

So my 2001 Sierra has developed a problem it can be hard to start after it sits a bit. It will start just fine after sitting overnight or shortly after been driving. There seems to be a time window from 10 minutes after being shutoff to a few hours where it's hard to start. I have been doing my research and it sounds like gas may be pooling some where causing the engine to flood. After so many hours the fuel evaporates and it will start right up. It is recommended to replace the fuel pressure regulator. Is this the correct part? How difficult is this to replace? I have worked on older vehicles before so I can turn a wrench, just curious how involved it is. Thanks!

 

http://www.partsgeek.com/gbproducts/PC/425...eek+Google+Base

txab Senior Enthusiast

txab

Posted
Posted

FP regulator looks like this:

 

fuelpressurereg.jpg

 

It is easy to change. I believe it is on the drivers side of the engine, hidden by the plastic cover. It will have a vacuum line connected to it. One way to check to see if it is bad is to pull the vacuum line off and see if there is any fuel present.

txab Senior Enthusiast

txab

Posted
Posted
Thanks guys, I will give it a shot this weekend.

Just don't buy it from the dealer for $126. You can buy it for $40 - $75 most places.

Ape0r Enthusiast

Ape0r

Posted
Posted

I just went through this issue on an old Corvette that I picked up this summer. Fuel isn't pooling, per se. Rather, your fuel system isn't holding pressure. Once the pump is off, a small leak (probably internal) will let the system depressurize while the engine is still hot. Once this happens, the gas boils in the fuel lines, and the engine is fed vapor when you go to start it, and it won't start until things repressurize properly.

 

Here are a few things to try:

- Drive for a while. Get it good and hot. Shut it down and let it sit for 20 minutes (or however long it takes to make it hard to start). Turn the ignition on for 10 seconds but do not crank. Turn the key off. Turn the ignition on for ten seconds, then start engine. This will prime the fuel system and let it crank right up.

 

- Borrow a fuel pressure gauge from autozone or the like and check the fuel pressure. If pressure drops noticeable after turning the key off, you have a problem. You can get valves to isolate issues, but they are hard to come by.

 

- FPR is most likely culprit, but you can check it by pulling the vacuum line and sniffing after running the truck for a while. If you see or smell gas at the disconnected vacuum line, that is indeed your problem.

 

Other probable causes are leaky injectors and the fuel pump. In the case of my previously poorly maintained Corvette, it was all three. At first it started and died and then would run fine. After FPR, it wouldn't start at all. Injectors made it a bit better, but it still struggled somewhat. Finally tightened up some hose clamps on a hose that had been used to replace a pressure accumulator, and that was the final fix.

hypergolic Enthusiast

hypergolic

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Alright I got the new regulator in, I had to use a far amount of pressure so I could get the clip on. Is this normal? Also I am going to replace the fuel filter while I am at it. Will the old fuel filter slide out of the bracket after I disconnect it? Thanks.

rjirvine Enthusiast

rjirvine

Posted
Posted

Did the vacuum line leak when you pulled it off the FPR?

 

I had to remove the bracket bolt for the fuel filter. Be careful with those nuts, and use a set of flare nut wrenches if you have some (the fuel filter is the reason I have a set).

 

Was the directions website helpful?

hypergolic Enthusiast

hypergolic

Posted
  • Author
Posted

Yes there was some gas in the vacuum line when I first checked it. I depressurized the system like the website said but I still had some pressure in the system when I removed the regulator. I was just concerned about the amount of pressure I had to use to get the new regulator in.

rjirvine Enthusiast

rjirvine

Posted
Posted

I had the same issue. I wound up rotating the unit back and forth a bit and it fit better. I think its just the new O-ring. It's amazing how well my truck starts and accelerates now.

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