26-10-2013, 09:48 PM
Well the theory behind it goes like so...
If you're having to squeeze the hand primer the lift pump isn't working as well as it should. When the engine is hot it heats up the fuel in the tank, thanks to the return flow from the fpr and injector leak-offs. It's harder to maintain flow and pressure with warm fuel, so although it starts with help from cold, it can't do the same when warm.
Does it cut out under load? Don't know what the fail-safes are on the siemens management, but can't imagine they're much different from bosch - if the pressure doesn't reach Xbar then it won't fire, or if it falls below Xbar then it'll shut down. Don't know though, may just impose an operating restriction instead.
Without testing it with proper kit you're always going to be taking a risk on fixing it, no way around it.
If you're having to squeeze the hand primer the lift pump isn't working as well as it should. When the engine is hot it heats up the fuel in the tank, thanks to the return flow from the fpr and injector leak-offs. It's harder to maintain flow and pressure with warm fuel, so although it starts with help from cold, it can't do the same when warm.
Does it cut out under load? Don't know what the fail-safes are on the siemens management, but can't imagine they're much different from bosch - if the pressure doesn't reach Xbar then it won't fire, or if it falls below Xbar then it'll shut down. Don't know though, may just impose an operating restriction instead.
Without testing it with proper kit you're always going to be taking a risk on fixing it, no way around it.