Short version of a long story I broke a rocker stud lost 2 push rods, they ended up in the pan with no damage to the internal parts [ crank ect] ran great till then. After a long costly shop visit I know the head on that side is good and all rockers studs, pushrods and four lifters were replaced timing was set to specs, but after a long set the truck starts great for 5 or so seconds then runs out of fuel or over fuels not sure but has difficulty running four three or four minutes and smokes bad, then clears up and runs like a champ. My tech says its problem is the Ipump I don’t buy this it runs to good after this and as long as it don’t set 3-4 hours or more it’s great. Any impute

 

have you done lift pump test sound like LP going south on it and the IP trying do all sucking which not good for the IP also check fuel filter

 

yes done and done. would the return lines have any effect on this prob

 

yes it would you may want to put clear fuel line on the return side of the pump to see if you air bubbles and or may have pin hole some where on feed side what yr is the truck

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i should ask you if truck stay running if you open the t-Valve

 

98, 6.2 mill block and eprom computer

 

i just went over reading your post again is this just happen when it cold start or hot too

also i know fuel sending units going bad sucking air

 

just cold after a long set. but pluged it in last night and gave it fuel on start up this morn and a lot better start

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glow plugs good

 

are you getting high idle at first start and do have spear PMD to try

 

normal idle no spear

 

at first start at cold you should be about 800 to 950 rpm if not getting that try unpluging the ECT at T-stat housing buy unpluging that it bring rpm's up even after engine warm you can up plug it still rise the rpm's maybe it not working that be test for it

also are you getting any codes