93' 5.9 Magnum fuel pressure issue
#1676072
09/23/14 10:00 AM
09/23/14 10:00 AM
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Joined: Jan 2003
Posts: 4,867 Upstate, NY
MikeP
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,867
Upstate, NY
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Hi all ! 1993 W250 5.9L Magnum. Was running rough, stumbles at idle, dogs out/back fires with any throttle. New I had a burnt plug wire. Did plugs, wire cap rotor. No improvement. Was messing with timing and decided to squirt a little gas into throttle plates and the engine smoothed right out. Couldn't hear the fuel pump come on plus the filter is on the pump in the tank, so I put a new pump and filter in. No improvement. I had fuel at the shrader valve on the rail. Went to Rock Auto under fuel and they listed a Fuel pressure regulator. There isn't one on this truck at the rail, Only SS braided line from hard line on frame to fuel rail. I disconnected it and had a piece of clear hose same diameter as male line inserted in to SS quick connect and turned on key. Plenty of fuel volume for 2 secs until the relay shuts it off. Put a guage on line and cycled the pump a couple times with key and could only get ~10 psi. During my troubleshoot I suspected voltage to pump, Ran a meter on line in and with truck running had 14.0 V. Cleaned all grounds. 1) What should the Psi be ? ~ 40psi? 2) Should I measure psi at Shrader vale on rail?(dont' have an adapter)Can I pull valve out like a tire shrader vale and plumb to guage? 3) Could it be plugged injector(s) ? Should I replace all of them?
Any advice appreciated !
"Think Pink" 67'Dart GT vert, 69' Newport vert, 67' Barracuda
and a pile of trucks 78'79'91'92 CTD
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Re: 93' 5.9 Magnum fuel pressure issue
[Re: 3hundred]
#1676080
09/24/14 09:32 PM
09/24/14 09:32 PM
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Joined: Dec 2010
Posts: 1,035 Missouri U.S.A.
71yelladustr
super stock
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super stock
Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
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92-93 magnums had the regulator on the fuel rail. In 94, they went to single line feed with the regulator in the fuel pump module.
392 gen III hemi on E-85 727 trans Dana 60 10.02@134
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Re: 93' 5.9 Magnum fuel pressure issue
[Re: 71yelladustr]
#1676083
09/25/14 01:12 AM
09/25/14 01:12 AM
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Joined: Nov 2003
Posts: 5,302 CA, Proprietor; The "PALOMINO"...
dynotune440
master
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master
Joined: Nov 2003
Posts: 5,302
CA, Proprietor; The "PALOMINO"...
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Quote:
92-93 magnums had the regulator on the fuel rail. In 94, they went to single line feed with the regulator in the fuel pump module.
93 magnums were weird... 5.2 mag had an inline fuel filter and a return fuel line with regulator in fuel rail. 5.9 mag had no inline filter, returnless fuel rail, and fuel regulator in fuel pump module assembly... Bought a few of these trucks for cheap because of a bad pump...
Dinuba, California, Home of the PALOMINO ranch and 440 truck farm, where dodge trucks have a home. Have Four 1979 dodge PALOMINO trucks now.
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Re: 93' 5.9 Magnum fuel pressure issue SOLVED
[Re: MikeP]
#1676085
09/27/14 09:13 AM
09/27/14 09:13 AM
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Joined: Jan 2003
Posts: 4,867 Upstate, NY
MikeP
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,867
Upstate, NY
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It was the ground. Siamesed splice right at pump plug then to Body. New pump has 50 psi. Thank you !
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