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Ask Daniel Wilson Your Own Question
Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 1634
Experience:  Owner at DJ Wilson
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Customer Question

Are you up and about?
Submitted: 11 months ago.
Category: Medium and Heavy Trucks
Customer: replied 11 months ago.
Detroit 8V71n I had the heads rebuilt and installed them torqued and retorqued them primed and bled ran the rack set timing at both the 1.6 and 1.8 settings have fuel at lines runs slightly for a few moments at idle but won't run rack and slides are fine very low mileage motor ran last month b4 teardown
Expert:  Wayne replied 11 months ago.

Hi I'm Wayne

I will try to help you with this issue

this sounds to me like the fuel pump is weak,

are you getting fuel to cross over lines as cranking over

this is important info

let me know

Customer: replied 11 months ago.
Which lines are those?
Expert:  Wayne replied 11 months ago.

HI

The cross over lines are on the injectors

Customer: replied 11 months ago.
I went to Detroit svc school about 20 years ago to svc 12/92s I'm rusty and I do an Inframe about once a year I forget which line feeds and which is return but the way I fire em up is to bust all the lines loose at the injectors and presureize the fuel tank to about 15psi with a small paint gun regulator ... Kinda barbaric I know but on occasion it has brought to my attention a weak fuel line so I've done this got fuel coming out of both sides and run through and tighten them then crank.... But it won't pull itself off the starter 5 seconds of chug and a little heat at best
Expert:  Wayne replied 10 months ago.

Morning

I am still leaning at the fuel pump

would not hurt to replace it