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Old 01-07-2016, 11:54 AM   #1
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Question 96 Dolphin 7.4 Vortec no fuel pressure

We recently purchased this motorhome and began maiden voyage from Terre Haute, IN to Charleston, SC. Just inside TN we stopped at rest area, when we restarted ran very rough and died. Cranked fine would not fire. let it set for a few minutes, started and ran fine. Drove toward Knoxville for about 30 miles and decided to stop for our first fill-up. Started, ran poorly as before, died, and would not re-fire. Plenty of spark, bought starting fluid, it would fire right off with a little spray in the air intake. Anyone know what to check or have a part number for a fuel pump? We have it at a large truck shop, but they won't look at it for a couple of days

Mike Layton

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Old 01-07-2016, 06:12 PM   #2
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There have been many posts on the loss of fuel pressure, in the GM/ Workhorse chassis forum , due to the pump being overheated by return fuel, dumping down on the top of the pump.

Was the tank below 1/4 full when the problem first happened?

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Old 01-07-2016, 08:47 PM   #3
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Had the same thing happen to me

I had the same thing happen to me. The first thing to check is the fuel filter and the fuel pressure. Mine was located in the line at the tank on the motor home that I owned at the time. That was not the problem. It was the fuel pump, which was located in the tank. They checked the pressure at a port on top of the motor. I only had 6 lbs pressure and it should have been 60 lbs. $1,160.00 dollars including overnight air freight. This at a GM Dealers. Good luck.
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Old 01-08-2016, 07:48 AM   #4
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Could be bad pump or supply.

Since it runs fine until stopped then faults and clears on retry get a voltmeter and check voltages.

If yiu can find a fuse for it and your meter has a 10 amp position lift the fuse and check current to pump.

It could be a sticking motor$$$$ Or a funny connection $ and lots of work
Tony & Lori
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Old 01-08-2016, 10:07 AM   #5
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Once had the same problem with the exact same RV. Mine was caused by a pinched wire going to the in-tank fuel pump. The wire was pinched between the tank and the frame. The fix was not too expensive. But it took a little time to track it down.
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