Trouble Starting Engine - HELP

[dripley]

3 hours ago, RAD said:

Recent observations 

 

went to crank it, nothing

waited a bit, same thing.

 

opend and bled three lines while LP was running, cranked it up and started. Let it warm up a bit and turned the A/C on. Noticeable rpm drop, but picked back up. I could not tell how many PSI it dropped, but it did. Turned A/C off, ran normally. Turned it back on, rpm and psi drop. Engine rpm picked back up and a few seconds later, it died. 

ECM and top of IP both cool to the touch. It ran long enough to move the water temp guage just over 140.

How do you know the pressure dropped if dont have a gauge connected? When I turn mine on you can hear the engine load up bit but the rpm then returns to normal quickly if there is drop. A fuel pressure drop for the AC on should be nil. 

[RAD]

3 hours ago, dripley said:

How do you know the pressure dropped if dont have a gauge connected? When I turn mine on you can hear the engine load up bit but the rpm then returns to normal quickly if there is drop. A fuel pressure drop for the AC on should be nil. 

I got one and put it on thursday, an in-line type between the fuel filter and IP.

 

[Marcus2000monster]

5 hours ago, RAD said:

It’s an airtex e7153

 

I suggest trying a new one temporarily and then getting a Airdog system. I had an airtex when I bought my truck that failed. I’m lucky I didn’t ruin my VP44 

[dripley]

13 minutes ago, RAD said:

I got one and put it on thursday, an in-line type between the fuel filter and IP.

 

Going to make it a bit difficult to know what pressure is under load. I lost my AD pump a few weeks back and would not have known with out my in cab gauge. Probably would have driven it until the VP burnt up.

[RAD]

I would like to try something to definitely rule out the LP.

i am want to take the airtex apart to look at the workings .

[dripley]

Checking the pressure under load would tell you pretty quick. I suspect you would be lucky to see 5 psi out that pump as much as it dropped free revving.

[RAD]

I would like to try something to definitely rule out the LP.

i am want to take the airtex apart to look at the workings .

 

 

i cannot even get 50’ without quitting.

Edited October 14, 2018 by RAD

[Mopar1973Man]

1 hour ago, dripley said:

Checking the pressure under load would tell you pretty quick. I suspect you would be lucky to see 5 psi out that pump as much as it dropped free revving.

 

Then all the restriction of the 6mm ID lines and the banjo bolts don't help it either. 

 

Then if it got a suction air leak as the engine load goes up the air leak will get worse and most likely what is stalling the engine out. When the bubble gets to the lift pump the pressure dies off. 

Edited October 14, 2018 by Mopar1973Man

[dripley]

43 minutes ago, Mopar1973Man said:

 

Then all the restriction of the 6mm ID lines and the banjo bolts don't help it either. 

 

Then if it got a suction air leak as the engine load goes up the air leak will get worse and most likely what is stalling the engine out. When the bubble gets to the lift pump the pressure dies off. 

All the more reason for a good fuel system.

[Marcus2000monster]

It will be well worth the investment to get a new system. When I was at that spot when I needed a lift pump I had a hard time convincing myself to get a good setup but I’m happy I did what I did. 

[Dieselfuture]

On 10/13/2018 at 7:22 PM, RAD said:

I would like to try something to definitely rule out the LP.

i am want to take the airtex apart to look at the workings .

I wouldn't mind seeing what the insides of that POS look like myself

[RAD]

10 hours ago, Dieselfuture said:

I wouldn't mind seeing what the insides of that POS look like myself

Don’t know much about this type of pump but it seems like it would be harder to blow through than it did!

i think if I tried to take it apart I would destroy too much of the guts to see what’s in it, but it’s out and on the concrete!!

 

 

 

It is a rollervane type pump. Better if you googled it and looked at the way it works.

Edited October 15, 2018 by RAD

[Mopar1973Man]

 

This is the old Carter pumps. 

 

[RAD]

40 minutes ago, Mopar1973Man said:

 

This is the old Carter pumps. 

 

??????

[RAD]

the stock pickuo tube or drawstraw(?) that is in the fuel tank, what is it made of?

[Mopar1973Man]

Stock pickup tube in the sender is just plastic. I know this is modified but you can still see the stock tubes hanging there.

 

 

As for the drawstraw its 1/2-inch plastic straw.

 

[RAD]

what are the chances of something going awry with the in tank unit that would allow it to suck air? the tank is not completely empty so now would be a good time to remove it and check thing out.

[Mopar1973Man]

If you got a stock sender I've seen where the plastic tube cracks and sucks air where its cracked and gets worse as the fuel level drops. I've seen a few trucks like this. 

[RAD]

well there you go, got to thinking last night, i have put fuel in it and was able to crank it with that lift pump that was on the engine.  the fuel level has dropped and  and was not able to crank it since last week. thats why i went ahead and too the LP off. i thought there may have been something other than a plastic tube sucking the fuel out of the tank that may have corroded and was sucking air once the fuel level got low enough.

[Mopar1973Man]

So throw 10 gallons in the tank and see if it makes a difference.