Copy of email I saved some time back from Michael Spreadbury. Wardy ----- Original Message ----- From: "Michael Spreadbury" <[EMAIL PROTECTED]> To: "Mark Ward" <[EMAIL PROTECTED]> Cc: "Ozdat Mail List" <[EMAIL PROTECTED]> Sent: Thursday, November 18, 1999 1:26 PM Subject: Re: fuel pump idea > At 09:39 PM 11/17/99 +1100, you wrote: > > >But has anyone thought about, or actually fitted an internal pump ? > > Nissan 300ZX internal fuel pump article > > By Michael Spreadbury > > Last weekend Steve Epperly and I installed a in-tank fuel pump from the 84 > 300ZX turbo into my stock 510 gas tank. The existing 280ZX external fuel > pump was replaced since it did not match the output of the 300ZX pump > (280ZX- 30 gph @ 70 psi vs. 53 gph @ 55-90 psi for the 300ZX pump.) I did > not want to worry about going lean from fuel starvation as I turned up the > boost so changing the pump to the 300ZX unit was the answer. > > The conversion was actually easier than expected. I pulled the tank and > pump from the donor 300ZX and took them up to the shop. Six small bolts > attach the pump into a captive ring in the top of the fuel tank. The > captive ring has a rubber o-ring and a curled edge that seals the fuel > pump. The captive ring in the donor tank needs to be removed (with a little > extra material to fabricate to). The pump itself simply unscrews from the > ring and is removable by just lifting it out. > > I had a clean 510 tank that had been flushed of gasoline years ago that we > decided to use as the new tank. Unlike what I expected, the stock 510 tank > does have two baffles to prevent fuel slosh. We decided to center the pump > on the top between the two baffles. This turned out to be a mistake as the > fuel sender is centered and it would hit the fuel pump when the tank was > full. By offsetting the fuel pump a little to the right, it cleared the > sender and did not hit the internal baffles. > > The captive ring was cut out of the donor tank with tin snips as it still > had a little gasoline in it. When that was removed we ground down the edges > leaving a little extra material to weld to. The ring was then placed onto > the 510 tank and tacked in place. Since the 510-gas tank is made from thin > sheet metal, it needs to be welded a little at a time to prevent warping of > the gas tank. When it was tacked in place, we slid the fuel pump to check > it for height. > > The 300ZX-fuel pump is actually taller than the 510 tank. This is good > since it is easily modified to make it shorter. The pump has three "legs" > that holds the assembly together. These legs have a bolt that attaches the > top portion of the pump with the lower portion. A rubber fuel hose attaches > from the pump itself (bottom) to the top portion (mounting ring) of the > pump. By redrilling the three legs about 3/8" lower than the original > mounting hole, the assembly can be shortened. The fuel line between the top > and bottom portion of the pump then needs shortening the same amount. We > then reassembled the pump and checked it for fit. Once satisfied that we > had the correct height we finished welding the captive ring into the tank > itself. Once the tank was cool, we slid the fuel pump into the tank > carefully aligning the rubber o-ring. Then it is just a matter of evenly > screwing down the 6 bolts. > > The original fuel return and outlet lines at the bottom of the tank were > also plugged as they now run out of the center of the fuel pump. I rerouted > my fuel lines to the top of the tank and plugged in the pump. We refilled > the tank with gasoline and fired her up. > > The first thing that I noticed was how quiet it was! My 280ZX external > pump, which was mounted in the base of the trunk, was very loud-- > passengers riding in the car would usually comment on the noise. I know > that others have placed their pumps under the car to try to quiet them even > more. I understand this works better than where I had mine mounted, but > this is the quietest pump that I have heard for a long time. > > This fuel pump has solved the fuel starvation problem that I was having > when the tank had less than 1/4 of a tank. > > I HIGHLY recommend this swap. Though not as easy to install as the external > 280ZX pump, it is worth the time and effort. The pump is the same for turbo > 300ZX's as well as non-turbos, so they should be easy to find. The local > pick-a-part sells pumps for $20 and the tank for $7.50. I talked with the > guys at the shop and they say that the pumps are very reliable and we > seldom change them. > > The only other trick will be to find a fabricator that is willing to weld > on fuel tanks-- many will not. > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
