94 GMC truck diesel starts,runs and then dies and will not start

I have a diesel van and what I do to prime fuel lines is to connect a fuel hose to the inlet of the filter. Using a fuel container. I know it is a rough rigging but it has kept me from towing my van to the mechanic

Fuel pump ? fuel pump relay ? Test the circuit . Fuel pump electrical circuit diagnosis no fuel pressure testing GM

The first thing I would check is fuel pressure. This type of fuel injection requires a minimum fuel pressure in order to operate. If fuel pressure is as little as one psi below minimum the vehicle will not start. You can try squirting a couple of shots of carb spray into the air snorkel while somebody cranks the engine over. If the engine starts and then dies you now you fpdeffinetely have a fuel issue. If the engine still won't start check for spark. Let me know what you find. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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not a fuel pump but an electronic problem from a start isolator or a brake sensor problem

YOU COULD HAVE RESTRICTED FUEL FILTER OR FUEL PUMP COULD BE FAILING. FUEL PRESSURE SHOULD BE 9 - 13 PSI FOR THE GAS ENGINE.IF YOU HAVE 6.2 DIESEL ENGINE YOU FUEL FILTER STOPPED UP OR YOU HAVE FAULTY LOW PRESSURE TRANSFER PUMP.YOU COULD HAVE FAULTY FUEL SOLENOID AT THE INJECTION PUMP.

Since you know the starter is good, now have the alternator and battery tested. If these are both good (if either or both are bad, obviously replace) then try replacing the starter relay; this will prevent a car from even turning over.

Also, check all starter fuses, iginition fuses and relays.

Q: Does the engine turn over?

Q: Does the engine start, then die, or just turn over?

Q: If it turns over, does it sound weak, or does it sound strong, like it's trying to start?

Q: Have you tired jump starting the truck? If not try this: if it starts and stays running, pull both battery terminals off. If the truck dies, replace the alternator. If it stays running, you may need to replace the battery. Look at the battery and see if there is a date sticker on it to indicate when the battery was purchased (or manufactured). (If diesel, have both batteries tested). If diesel, if jumpstarting from one battery doesn't work try the other one. Also, if diesel, make sure there is at least 1/4 tank of fuel as some diesels won't start if very low on fuel (pump does not reach very bottom of tank and will not syphin fuel in).

If gas/diesel, and it turns over, turn the key to the on position and have someone lean down at the back side of the truck (driverside) and listen for the fuel pump to engage. If no noise is heard, consider replacing the fuel pump. Inquire with an auto parts dealers as to whether or not this truck is equipped with a secondary fuel pump (usually located mid-way on the chassi).

Please let me know if you need further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

Its called the fuel pump cylinoide which is attached to the fuel pump. Unless the fuel pump is bad, you got an expensive part to buy around $2500 or the cylinoide is $900 whichever is broken. This is a know issue for GMC deisel suburbans 6.5.

check your gas. did you get fuel at a different location than you always do? if it's not the gas then your fuel pump is going bad

Sounds like the fuel pump got air in the system. You may have to bleed out the air. Then it will run. Check the fuel tank for fuel first.

I had the same problem with my 94 chevy 6.5 diesel,and spent alot of money trying things that people told me to try.I wound up taking it to the dealer and they told me it was the injection pump.They put one in it and that fixed it.It has run great for over a year and a half.This set me back about $4000.00!