Returnless Fuel Pressure & Volume Quick-Fix

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Returnless Fuel Pressure & Volume Quick-Fix

Modern automotive fuel delivery systems are fully returnless systems. This was done to prevent hot fuel from returning back to the tank, creating excessive fuel vapors. For this reason, testing these system is done totally different. Here are the facts about the Returnless Fuel System.

1) In Returnless Fuel Systems there is a fuel pressure Shrader valve.
2) Many vehicles exhibit misfire issues due to LACK of VOLUME not pressure.
3) Any fuel system can deliver a fixed fuel pressure, say 40 PSI, but the volume delivery may be way off.
4) The rule of thumb is that any engine will need at least 0.3 gallons per minute to run properly.
5) On any fuel system, but especially on returnless systems, it is important to test both, pressure and volume.
6) To test fuel pressure and volume on returnless systems, a shut-off valve should be used in-line with a fuel valume gauge.
7) Simply connect the shut-off valve at the output hose and close it. Connect a charger to the vehicle's battery and jump the fuel pump. Record and compare the dead-end fuel pressure to the correct specification.
8) Open the shut-off valve, letting fuel into a safe container, until the fuel pressure just starts to drop bellow specifications. At that time, record the fuel flow and use the 0.3 gallons per minute Rule-of-Thumb.

This test is also done to detect a faulty fuel-pump. Just don't forget to work the fuel-pump at 100%, since returnless system are mostly using a varianle speed fuel-pump pulse width modulation control scheme, which will skew this test. So, jump the fuel pump at 100% load to do the test. That's it for the Returnless Fuel Pressure and Volume Quick-Fix.

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