Lil help needed with no start

[muzzy1maniac]

A few weeks ago I was doing my daily driving. I parked the truck at work for about 5 mins, came back and the sucker wouldn't start. It turned over like a champ - sounded like it was flooded. I let it sit for a few hours and tried with no luck. I had it towed home and later that night I tried and it still wouldn't start.
Now for the fun... I let it sit for almost 2 weeks cause my schedule wouldn't permit me the time to mess with it. I got in and the bitch started right up! I'm not really sure where to start. Could it be the fuel pump is on the way out? I hate intermitent problems! I don't recall the pump whining when it had the no start. I also don't hear it now like I used to.

[MT-2500]

Originally Posted by muzzy1maniac

A few weeks ago I was doing my daily driving. I parked the truck at work for about 5 mins, came back and the sucker wouldn't start. It turned over like a champ - sounded like it was flooded. I let it sit for a few hours and tried with no luck. I had it towed home and later that night I tried and it still wouldn't start.
Now for the fun... I let it sit for almost 2 weeks cause my schedule wouldn't permit me the time to mess with it. I got in and the bitch started right up! I'm not really sure where to start. Could it be the fuel pump is on the way out? I hate intermitent problems! I don't recall the pump whining when it had the no start. I also don't hear it now like I used to.

You need to catch them in the act.
You might run a good fuel pressure check and check for codes.
The next time it does it check for lose of spark or fuel pressure.
And see if the old fuel pump has the hum sound.
Good luck MT

[MT-2500]

PS
Good way to check/test fuel pump is to hook a pressure gauge up and tape it to windshield or mirrow and drive it. Make sure fuel pressure stays in specs.
Even a few lbs low will cause a no start cold.
Good Luck and let us know how it goes.
MT

[Blazer SS]

Try this, because of the oil companys complience with the new EPA demands. (thats their excuse) They have run their tanks dry at the gas stations. that means all of the crud and water that makes its way into them that was supposed to be stopped by the filters could have found its way through and into your gas tank.

Check or replace your fuel filter, if it hasn't been done in a while you have to do it any way.

Check your intank filter sock, it could also be partially clogged, causing the different sound from the fuel pump. Replace that anyway if you go through all of the trouble of dropping your tank.

When you go to replace your fuel filter. Run a piece of rubber tube from the tank side of your filter tube and into a container, while you watch have someone turn your key to the acc. position but do not start it, watch for the flow of gas, it should flow at a prescribed rate. Look at your manual to see how fast it should fill your container. Have them turn off the key way before the container fills to account for the ebb.

Sorry about the lack of order, but do the flow test first. it takes maybe 30 min from start to finish, And will tell you if the problem is ahead or behind the fuel filter.

[muzzy1maniac]

JUst to answer a couple of the things posted.

I have no problem with a cold start. The fuel filter's age is unknown and will be replaced( I have it on work bench waiting).

The only code I'm throwing lately is the P0441 which is evap. I wouldn't think this would cause a no - start. I cold be wrong of course..

I live in the stix and drive 40 miles each way to work. I almost never let the tank get under 1/4 tank.

The problem is I'm afraid of getting stranded again.
I'll check the pressure for kicks

Is it possible the pump is overheating and shutting down?

[MT-2500]

Originally Posted by muzzy1maniac

JUst to answer a couple of the things posted.

I have no problem with a cold start. The fuel filter's age is unknown and will be replaced( I have it on work bench waiting).

The only code I'm throwing lately is the P0441 which is evap. I wouldn't think this would cause a no - start. I cold be wrong of course..

I live in the stix and drive 40 miles each way to work. I almost never let the tank get under 1/4 tank.

The problem is I'm afraid of getting stranded again.
I'll check the pressure for kicks

Is it possible the pump is overheating and shutting down?

Yes it is possiable all the more reason to put a fuel pressure gauge on it and drive and check it.
GLet us know how it goes.
MT

[muzzy1maniac]

Went out last night and the beast wouldn't start!!! First test down - got spark. No whine from the fuel pump. should I be checking any relays etc??

[MT-2500]

Originally Posted by muzzy1maniac

Went out last night and the beast wouldn't start!!! First test down - got spark. No whine from the fuel pump. should I be checking any relays etc??

First check for voltage to relay and then for voltage to fuel pump.
Some have a fuel pump prime connection . Good place to test.
If voltage to fuel pump and good ground and no run.
You have found the problem.
Sometimes a good whack on the bottom of fuel tank will wake up a dead pump but it will not live long.
MT

[muzzy1maniac]

Been trying all day to get the damn filter off. I soaked it with pen oil and will try it again in the morning. Still no life from the pump. I found the relay under the hood but how do you test it???

[MT-2500]

Originally Posted by muzzy1maniac

Been trying all day to get the damn filter off. I soaked it with pen oil and will try it again in the morning. Still no life from the pump. I found the relay under the hood but how do you test it???

Find the gray wire to fuel pump. Check for good 12 volts on it with volt/ohm meter and also check for good ground to fuel pump.
Look for the fuel pump prime connector. single wire with a plastic end on it .
May be red gray or green conbination. If you can not find it look forthe wiring plug in to fuel pump underneeth.
MT

[muzzy1maniac]

What side will these wires be on? Do I have to drop the tank to see them?

[MT-2500]

Originally Posted by muzzy1maniac

What side will these wires be on? Do I have to drop the tank to see them?

The fuel pump plug wiring is in will be in front of fuel tank drivers side.
Gray is fuel pump power wire and black ground.
Prime connecter and relay is under hood.
Again gray for fuel 12 volt power to pump power. The relay is usually fused for power.
If you need a wiring pdf on it e mail me at [email protected]

But it may be tonight before i can send it back to you..
MT

[muzzy1maniac]

Originally Posted by MT-2500

The fuel pump plug wiring is in will be in front of fuel tank drivers side.
Gray is fuel pump power wire and black ground.
Prime connecter and relay is under hood.
Again gray for fuel 12 volt power to pump power. The relay is usually fused for power.
If you need a wiring pdf on it e mail me at [email protected]

But it may be tonight before i can send it back to you..
MT

Ok I'm pretty lost on this. I see the wiring for the pump. There is no spot to probe it under the truck.
I have no idea what you mean by the "relay is fused" nor can I find the prime connector. I assume it's under the hood - I've searched but still can't find it.

What is the probablity of the problem being with the wiring or relay verses the pump?

I've given up on removing the fuel filter since I started really screwing up the line nut! I guess I'll breack out the torch!

[MT-2500]

Originally Posted by muzzy1maniac

Ok I'm pretty lost on this. I see the wiring for the pump. There is no spot to probe it under the truck.
I have no idea what you mean by the "relay is fused" nor can I find the prime connector. I assume it's under the hood - I've searched but still can't find it.

What is the probablity of the problem being with the wiring or relay verses the pump?

I've given up on removing the fuel filter since I started really screwing up the line nut! I guess I'll breack out the torch!

The pdf is in the mail let me know if you get it.
It could go either way but if fuel pump has never been replace it may be it.
If it no go or run give it a thump on bottom of tank.
Let us know how it goes.
MT

[muzzy1maniac]

Just a thought - Could I pull the fuse/ relay box up and probe the connectors on the bottom? It looks like there are only 3 screws holding it down. What kind of trouble could I get into??