I'm using an LS3 engine so need a high pressure pump that will deliver a constant 65 psi, controlled by a fuel pressure regulator. The Bosch 044 or equivalent is recommended. All the pumps instructions say that a pre-pump filter must be used and that the pump should be no more than 600mm from the tank outlet. Achieving 600mm is a bit difficult with the AK if a pre filter is used but I didn't want to risk damaging the pump so I've had to compromise a bit.
I have pushed the filter as far back as I can on the chassis rail, ensuring sufficient radius of the bend in the fuel pipe, and fitted the pump as close to it as I can, allowing for the connecting fuel hose to go around the angle in the chassis rail at that point. I've also replaced the fine cartridge filter inside the filter can with a 50 micron metal filter to minimise flow resistance. So I have about 750mm between the tank and the pump and have made a mental note that if I have fuelling issues in the future that's the first thing to look at............!!
The filter is fitted with the spring clips provided, riveted into the chassis. The pump wasn't so easy because I didn't have a drill small enough to get in between the chassis rails to drill hole for the fixings. So I decided to drill the chassis rail right the way through from the other side and fit rivnuts in that side. I then secured the pump by using long bolts through the chassis rail into the back of the rivnut. It works a treat and means its reasonably easy to remove the pump in future.
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| Rivnuts fitted in opposite side of chassis rail |
I need to decide now whether to put a fine filter down stream of the pump prior to the fuel rail. I think its probably worth doing. Injectors have some very fine jets in them.
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