Help! 1992 E350 LPG crank no start
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Help! 1992 E350 LPG crank no start
Hi all,
My 1992 E350 (5.8l) is LPG-powered and recently ran out of gas (really need to get that gauge fixed....). Once I turned on the spare tank, which is a forlift tank, it's cranking but not starting. I've checked for spark and that's good. I'm confident it's a lack of fuel getting though the system. Any troubleshooting tips specific to LPG?
Thanks!
My 1992 E350 (5.8l) is LPG-powered and recently ran out of gas (really need to get that gauge fixed....). Once I turned on the spare tank, which is a forlift tank, it's cranking but not starting. I've checked for spark and that's good. I'm confident it's a lack of fuel getting though the system. Any troubleshooting tips specific to LPG?
Thanks!
Fleet Owner
Joined: Aug 2010
Posts: 21,255
Likes: 1,657
From: Reynoldsburg, Ohio
Nothing specific I can offer other than asking if when switching tanks it's done with a switch or some sort of hand-operated valve? If via switch is the solenoid powered by a fuse protected circuit---if yes is that fuse open or "blown"?
Sorry if that's not helpful but I'm not familiar with the LPG systems.
Sorry if that's not helpful but I'm not familiar with the LPG systems.
Fleet Owner
Joined: Aug 2005
Posts: 23,668
Likes: 301
From: Easton,Ks
CHECK FUEL PRESSURE
Make sure manual shut-off valve is closed and that vacuum is released from fuel lock.
Remove 7/16-inch pressure test plug from converter/regulator and install pressure gauge.
Open manual shut-off valve and apply 51 kPa (15 in-Hg) vacuum to fuel lock.
What is pressure gauge reading?
4-5 kPa (1.25-1.5 psi)
GO to A14.
Over 10 kPa (3 psi)
SERVICE or REPLACE converter/regulator.
A14:
Remove converter/regulator cover.
Inspect diaphragm for holes or other damage.
Is diaphragm OK?
Yes
GO to A15.
No
SERVICE or REPLACE converter/regulator.
A15:
Inspect secondary valve for leakage.
Is valve leaking?
Yes
SERVICE or REPLACE converter/regulator.
No
GO to A16.
A16:
Remove carburetor air valve.
Inspect air valve diaphragm for holes or damage.
Is diaphragm damaged?
Yes
SERVICE or REPLACE carburetor body.
No
GO to A17.
A17:
Inspect gas valve and seat for damage.
Is either part damaged?
Yes
REPLACE air valve and carburetor body.
No.
GO to A18.
A18:
Check for loose carburetor mounting bolts.
Check carburetor mounting gasket for leaks.
Are bolts loose or does gasket leak?
Yes
TIGHTEN bolts or REPLACE gasket.
No
GO to A19.
A19:
Inspect carburetor base and intake manifold for evidence of cracks.
Are cracks visible?
Yes
REPLACE carburetor or intake manifold.
No
GO to A20.
A20:
Adjust idle mixture screw in until fully closed.
Back screw out six complete turns.
Attempt to start engine.
Does engine start?
Yes
ADJUST «idle mixture» to proper setting as outlined.
No
CHECK engine for mechanical or ignition system concerns.
Make sure manual shut-off valve is closed and that vacuum is released from fuel lock.
Remove 7/16-inch pressure test plug from converter/regulator and install pressure gauge.
Open manual shut-off valve and apply 51 kPa (15 in-Hg) vacuum to fuel lock.
What is pressure gauge reading?
4-5 kPa (1.25-1.5 psi)
GO to A14.
Over 10 kPa (3 psi)
SERVICE or REPLACE converter/regulator.
A14:
Remove converter/regulator cover.
Inspect diaphragm for holes or other damage.
Is diaphragm OK?
Yes
GO to A15.
No
SERVICE or REPLACE converter/regulator.
A15:
Inspect secondary valve for leakage.
Is valve leaking?
Yes
SERVICE or REPLACE converter/regulator.
No
GO to A16.
A16:
Remove carburetor air valve.
Inspect air valve diaphragm for holes or damage.
Is diaphragm damaged?
Yes
SERVICE or REPLACE carburetor body.
No
GO to A17.
A17:
Inspect gas valve and seat for damage.
Is either part damaged?
Yes
REPLACE air valve and carburetor body.
No.
GO to A18.
A18:
Check for loose carburetor mounting bolts.
Check carburetor mounting gasket for leaks.
Are bolts loose or does gasket leak?
Yes
TIGHTEN bolts or REPLACE gasket.
No
GO to A19.
A19:
Inspect carburetor base and intake manifold for evidence of cracks.
Are cracks visible?
Yes
REPLACE carburetor or intake manifold.
No
GO to A20.
A20:
Adjust idle mixture screw in until fully closed.
Back screw out six complete turns.
Attempt to start engine.
Does engine start?
Yes
ADJUST «idle mixture» to proper setting as outlined.
No
CHECK engine for mechanical or ignition system concerns.
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