System Interface
Multec 3.5 Fuel Injector Application Manual
4-8
Delphi Energy and Chassis Systems
Revision: 11/05-1
•
Minimize pressure drop to injectors at maximum required engine
flow rate.
•
Minimize pressure variation between injectors during all operating
conditions.
•
Minimize pressure disturbances created by the injector opening and
closing events, which may in some cases result in port-to-port flow
variations.
•
Consist of conduit of sufficient volume to temporarily store fuel
vapor generated during hot soaks to prevent vapor from being
ingested in the injector during engine re-start.
•
Constructed of materials suitable for fuel / environment compatibility
which will not degrade over time and contaminate the injector.
The chassis fuel supply system should be designed to supply adequate fuel
flow and pressure over the intended operating range of the engine. Refer
to section 2.3.
4.3
Seal rings
Seal ring seals are supplied with each injector. If replacement seals are
required, use only Delphi-supplied replacement seal rings. Reference
section 3.3.6
Note
Lubricate the seal rings with an approved lubricant or equivalent (see
Table 6-2
) The lubricant application process must prevent lubricant from
contacting the director plate, which could possibly restrict the injector
flow.
Caution
Do not use lubricant that will cause harm to oxygen sensors, (such as
those based upon or containing silicone). Reference Delphi Oxygen
Sensor Application Manual.
Warning
It is preferred to not reuse the seal rings when re-installing an injector. If
re-use is necessary, carefully inspect each seal ring for any signs of
damage, as even minor defects can lead to fuel / vacuum leakage. Always
install injectors and seal rings using the recommended service procedures
to avoid the possibility of a safety hazard. Seal ring lubricant is required
to prevent tearing the seal during installation in its mating component.
Warning
When installing seal rings to the injector inlet, take extra care not to
damage the seal on the injector top flange. See
Figure 6-1
.