1998 GMC C3500
35,250 MILES
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This dump truck has two gas tanks, but at 1/2 tank it will run out of gas. Does the rear tank have a pump or is there a transfer pump some were?? Thank you!!!!!
Apr 6, 2013 at 12:47 AM
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ASEMASTER6371
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each tank has a pump.

the one that stops working may have a hose failure in the tank. have it checked

Roy
Apr 6, 2013 at 12:49 AM
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some times when i turn the key on you can hear a rattle sound noise for one sec. then it stops! Is there a chance that it has a frame pump to?
Apr 6, 2013 at 12:58 AM
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ASEMASTER6371
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should not be. the pump will run for seconds key on engine off.

the pump will start up when cranking and running

Roy
Apr 6, 2013 at 1:00 AM
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Sorry for all this, But i dont know!!! The rattel noise is different then the huming noise from the one fuel pump you always here when i turn the key on!!
Apr 6, 2013 at 1:09 AM
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ASEMASTER6371
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ok, lets do this. start with a fuel pressure test on both tanks to see what kind of pressure is coming. you can rent one from a parts store with instructions

Roy
Apr 6, 2013 at 1:11 AM