M1009 FUEL PRESSURE

jmas24

New member
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wv
Hello,

Fairly new to the forum and the M1009. Especially fairly new to diesel engines...

Spring 2019 (yea i know) replaced a rusty gas tank in the blazer. Thought it would be a simple fix and needless to say she's still not on the road... I have had multiple mechanics stop and play with it and nobody can figure it out.
Since replacing the gas tank and re-bled the lines, the 6.2 diesel will idle but will lose fuel pressure or what we assume suck air somewhere and stall out. After a new injector pump (which the old one was probably fine), 3 fuel filters and all lines checked for air it will still only run about 4 miles and will not take on any hills before it stalls out. Dropped the gas tank multiple times to check the filter, replaced fuel pump and have 10PSI, changed the diesel in the tank. We are running out of options... Any thoughts or tricks?

1986 6.2L Diesel M1009 on 35's with 6" lift.

thoughts on the replaced rubber line collapsing? Should we switch that 4 foot of rubber back to metal? Thought about an electric pump? Just want to get her back on the road.. ran COMPLETLY fine before the first mechanic replaced the fuel tank. Could it be the wrong tank? wrong size sending unit? anything?
 

Barrman

Well-known member
4,446
103
63
Location
Giddings, Texas
Try removing the fuel cap and running it. It could be a fuel tank venting problem. Otherwise, I would suggest following the steps in the -20 manual trouble shooting section exactly.
 

jmas24

New member
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1
Location
wv
Try removing the fuel cap and running it. It could be a fuel tank venting problem. Otherwise, I would suggest following the steps in the -20 manual trouble shooting section exactly.
Have bled the system countless times and let it idle etc.. have also ran with the cap off and changed caps. Dropped the tank twice and Changed vent line. Gas cap spring is clean and working . Originally we thought it was just an air lock issue but weren’t sure how that was affecting the diesel motor.
 

dependable

Well-known member
1,665
90
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Location
Tisbury, Massachusetts
Make sure fuel return line is working. If you used proper 3/8ID fuel line, the 4 ft of rubber should not be a problem. I'd check to see that none of the lines are pinched. Did you make sure pick up tube did not have any rust or debris in it when tank was out?

One test you can try is to put compressed air into fuel tank, blocking fill hole w rags, and see if you can detect any leaks.
 

jmas24

New member
3
0
1
Location
wv
Make sure fuel return line is working. If you used proper 3/8ID fuel line, the 4 ft of rubber should not be a problem. I'd check to see that none of the lines are pinched. Did you make sure pick up tube did not have any rust or debris in it when tank was out?

One test you can try is to put compressed air into fuel tank, blocking fill hole w rags, and see if you can detect any leaks.
Will give that a shot.. haven’t found any leaks but again I guess hard to tell if it’s so small..
 
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