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05-19-2014, 11:51 AM
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#1 |
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Senior Member
Join Date: Aug 2011
Posts: 192
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CSFI system gremlins
Having a little head-scratcher with this system. The power plant is a 1997 350, its in a grumman food truck.
When you turn the key ignition to on the pump will prime and will read 60psi on a fuel gauge. The truck starts just fine and idles fine for 2-5mins. However if you start to drive it let it idle longer than 5 mins the fuel pressure will constantly drop until the truck stalls off. You can if you're quick cycle the key off than on (while the truck is running) and the pressure will spike back up to 55psi and continue to run fine. The regulator and pump have both been replaced and the problem persists. There are no noticeable signs of a leak, on ground/in the intake. Any help or direction would be greatly appreciated. Thanks |
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05-19-2014, 11:55 AM
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#2 |
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Senior Member
Join Date: Aug 2012
Posts: 1,458
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must be electrical. possibly the fuel pump relay tips making a poor connection. as they heat up the pump dies off.
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05-19-2014, 01:04 PM
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#3 |
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Senior Member
Join Date: Oct 2009
Location: Summerville
Posts: 4,431
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Id monitor how many volts are going to the pump.
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Griffin Transmission -Home of the most badassest Monte Carlo- Cell: 843-276-0554 Shop: 843-793-4607 04 RSX 06 Ridgeline 86 Monte Carlo |
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05-19-2014, 08:55 PM
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#4 |
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Senior Member
Join Date: May 2009
Location: Charleston, SC
Posts: 1,489
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Fuel tank not venting. Open fuel cap and run it to see if the pressure holds. That would be my first test.
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Jaime |
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05-20-2014, 04:42 AM
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#5 |
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Senior Member
Join Date: Oct 2011
Location: Easley
Posts: 2,300
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Sounds like what one of my cars is doing.
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Linear Mode
