Losing Fuel Prime

[JDFG1974]

I have a 2001 CH613 with a E7 460. It quit on me the other day like it was running out of fuel. Luckily it made it back to the shop, but after I shut it down and tried to start it back it did nothing but spin over. I put a new supply pump on it ( the one on the side with the hand primer) . Took for ever to get it started. After it started drove it for about 30 min. and parked it , thought it was fine. Went out to start it today and it ran for about 5 - 10 min. and started skipping like it was running out of fuel. Never started again without filling filters up. Once it used all the fuel in the filters it quit again. Anybody have any ideas?

Edited October 15, 2013 by JDFG1974

[Challenger]

Check you fuel tank for trash or large contaminants that could be blocking the pickup tube. We had a truck that would run fine and then just run out of fuel. Shined a light in the tank and found the fuel cap lock inside the tank. We've found alot of other trash over the years to, napkins, gloves, gravel but these were put there on purpose. The fuel cap lock just broke off and caused problems.

[krismoriah]

are u gaining oil on the dipstick? could be a broken tube or o-ring on the injector..spraying fuel under the valve cover causing u to lose prime.

Thats probably the last place u want to look if its not a blockage or trash in the system.

[theakerstwo]

I just last Friday repair a E7 for fuel in the oil.We run it on some fuel with dye in it and then pulled valve covers and black lighted it.[t was injector o/rings leaking up and into the oil.

[JDFG1974]

Thanks guys. Still had the same problems this morning. Changed all fuel lines, check valve, all the brass fittings, fuel filters again, and the supply pump. Still doing the same thing . I'll check the pick up tube tomorrow . Is there a special kind of dye that goes in the fuel to check the orings on the injectors . Also is there any special tools nessary to pull the injectors out of the E7. I'm no master mechanic but common sence goes a long way. Really hope it doesn't come down to that, but it's not looking good . Thanks for the info.

[theakerstwo]

for dye that I use in fuel I get from cummins and it is for using in oil but will work on fuel and have used for years.No special tools need to pull E7 injectors.

[teleman]

this is going to sound stupid since I dont know anything about the newer motors so .......anyway when my B model was doing that I remembered what my dad said and and took off the fuel cap and sure enough it kept running,tank vent was plugged...Jim

[boyd]

take you a 5 gallon jug and sit it on top of motor run the suction line off of the lift pump to the jug full of fuel that is higher than the pump. if it is a suction problem example debris or a loose or bad line this will let you know that. If it still does the same thing it is after the lift pump.. The Lift pumps that Mack used on these models where nothing short of junk. they are a fiber gear with a brass bushing inserted into it is not splined or anything and they have been known to spin inside the fiber gear, and when you have one that spins it is hard to tell. you have to hold the stainless shaft with needle nose pliers and spin the fiber gear. i have had them spin some days and some days it would be fine..

[thomastractorsvc]

So what did you find that was wrong with it?

[Richard 1977]

My 2001 460 is leaking  outside! No  fuel inside so do I just get a new transfer pump? It has been glued up before by the looks of the mating surface?

[Roth1]

Good morning.   My husband's 2007 Mack, MP7 is randomly losing fuel prime and quits.  Sometimes it won't start and now quits while going down the road.  He has had the fuel pump, fuel filter base and fuel filters replaced.  It has been in the Mack shop 3 times and another mechanic twice.  Currently back at the Mack shop as it quit on him in busy traffic.  Any help is appreciated.   

[fjh]

You may be looking at injector cups and injectors at this point has any of the shops done a combustion in fuel test?