Recommendations and Precautions Multec 3.5 Fuel Injector Application Manual
7-6 Delphi Energy and Chassis Systems
Revision: 11/05-1
Equivalency to Sta-Bil
is
defined as:
1. Having similar chemical composition so as to not have an adverse
affect on materials of the fuel system.
2. Having similar stabilizing affects on the fuel as demonstrated by the
manufacturer.
This will minimize the possibility of residual fuel in the injector from
oxidizing and forming gum and varnish. Gum and varnish deposits in the
injector may degrade the injector flow performance.
Injectors received from the Delphi production facility should be stored in
a clean and dry environment before use (see section 6.2).
7.4 Preventing Engine Hydro-lock
Engine hydro-lock occurs when a fuel quantity is delivered that is greater
than the minimum volume of the engine cylinder. The minimum engine
cylinder volume occurs when the piston is at Top Dead Center (TDC) and
is calculated as follows:
rationcompressio
cylindersofntdisplacemeEngine
TDCatVolumeCylinder
#/
=
Caution
In order for engine hydro-lock to occur, fuel must be present in a cylinder
with sufficient volume to restrict the piston’s movement when
approaching TDC during the compression stroke.
The maximum allowable on-time for the fuel injector can be calculated as
follows:
)/(/)/(
)(
mlgDensityFluidsgFlowStaticInjector
mlTDCatVolumeCylinder
TimeOnMax =−
7.4.1 Engine Prime Pulse at Start
In some cases, the engine control software commands an injector prime
pulse during the engine start procedure. The prime pulse is intended to
provide the initial fuel to start the engine during cranking. Depending on
the engine control software, a prime pulse may be delivered at start of
cranking. It is recommended that the sum of 5 sequential prime pulse
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