Thread: EFI Fuel Rail Pressure

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Originally Posted by t-top havoc

Can you test the spray pattern yourself?
Just wondering if you could, then you may be able to see leaks // clogs?
Does the pump lose power // prime?
Sorry for the dumb questions, I do realize not a lot of people have injector flow testers.

No, I don't have an injector flow tester, but I've seen some explanations on how to build a station to cycle them open/closed for cleaning. If the in tank cleaner doesn't work later today I may be looking at that next, after checking resistance on each one.
No, the pump is fine. The normal operating mode is that the pump is energized for only about three or four seconds to prime the system with "Ignition ON", and then it's interlocked with an "Engine Run" signal. If you turn the ignition "ON" and don't go to "Start" then it primes and the pump stops. It had a full tank of gas (15 gallons), and no reason to think that fuel pressure was low as it ran strong, but fat. My fuel pressure gauge is a little 1" dial on the fuel rail supply.
On Friday coming back towards home (still on the highway) I punched it in fourth, took it up to about 4000rpm and when I let off got a rapid exhaust pop along with what I know would have been a long visible flame had it been at night (lake style headers with baffles, exit just in front of the doors). I dumped a bottle of cleaner in it last night, and this afternoon will take it out for a run to see what it does. I'm not overly optimistic, but hopeful.