Automobile / GMC / Safari

Question: 2001 GMC Safari  mileage: 103,000. My GMC Safari stopped running. After going through the whole fuel system I found that the fuel pump was bad. I had only forty psi. When I replaced the pump the van started right up. The pump gave me sixty psi then the van stopped again, no fuel pressure at all. I can hear the pump running. I climbed under the van to see if it was leaking, I found I had fuel coming from my muffler. Can you tell me what happened and how to fix it?

Answer: It appears that the fuel pressure regulator diaphragm has failed, dumping raw fuel into the engine. Another possibility is that a fuel injector stuck open. Replacing the faulty part should fix your problem.

Question: 2002 GMC Safari Van mileage: 85,000. Within about six days, our van has rapidly developed a starting problem when the engine is cold. The temperature has dropped in the last few days making the problem worse. If the engine has run for only a few minutes, you can shut it off and it will restart right away. My first thought was the fuel pump because it has the loudest fuel pump I have ever heard and now I can barely hear it. However, I can drive down the road, open to full throttle and the van takes off like it always has. This morning the only way I got it to start (it was 15 degrees F) was to switch the key to ON for a few seconds and shut it to OFF, repeat 2-3 times then turn to START. Then it would start, but not quite as well as it normally has done. Should, but at least it was running.

Answer: Do a fuel pressure test when you are having hard starting problems. You will probably find a faulty fuel pump or fuel pressure regulator. If the fuel system checks okay, scan the computer for fault codes.

Question:  2000 GMC Safari all-wheel drive mileage: 140,000.  The oil pressure drops dramatically when the engine warms up.  This started after I got the van back from a dealer shop.   It was in the shop for seven months; the original problem was it would cut out while driving.  They replaced almost all of the electrical parts to the engine.  Would the bearings go out that quickly without any gradual decrease in pressure?

Answer:    The oil pick-up screen may be plugged. We recommend replacing the oil pump. With 140,000 miles, it would be a good idea

Question:  1999 GMC Safari  mileage: 98,000.  The van’s alternator was diagnosed with a bad bearing.  The battery has been replaced recently.  The service engine light has come on occasionally and the van has hesitated.  This morning the truck started and ran for 5 minutes.  The engine was turned off and would not start again.  There is now no interior lights or headlights or radio.  Fuses are good.  The engine will turn over.  Any reason why the truck will not start?

Answer: Your car is equipped with a computer controlled engine management system.  An independent auto service center can scan your computer for fault or error codes.  The information should pinpoint the malfunctioning components

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