88 and up fuel pump in 86??

[cowden_12]

So my new project car seems to have have burned up both fuel pumps. Its and 86e car and as you all know it has the primary and secondary pumps. With out going to a walbro setup or anything of the equivalent has anyone ever just used the oem single in tank pump from the 88 and up cars and bypassed the external pump??? To buy the two pump combo just seems rediculous at the moment and aside from the wire connectors being different this is about as oem of an alternative i can think of.

[blueapplesoda]

You will need to adapt the fuel pump outlet (usually 5/16 or 8mm) to the larger diameter tube (1/2"?) on the pump hanger, and you may have to cut the large diameter fuel feed tube to fit the pump onto the hanger. If you have to cut the hanger, make sure you clean the hanger well; metal bits in your fuel system will kill everything.

Remove the entire external pump assembly and adapt the large hose from the tank to the 8mm (5/16) fuel feed hose/tube that runs to the fuel filter inlet.

I believe I used two brass pex fittings from lowes (3/8" to 1/2") for the adaptation.

Derek

EDIT: You should figure out why the fuel pumps burnt up in the first place...it may not be the pumps at all, but In my case it was, so I had to do this on my 84 eta.

[cowden_12]

You will need to adapt the fuel pump outlet (usually 5/16 or 8mm) to the larger diameter tube (1/2"?) on the pump hanger, and you may have to cut the large diameter fuel feed tube to fit the pump onto the hanger. If you have to cut the hanger, make sure you clean the hanger well; metal bits in your fuel system will kill everything.

Remove the entire external pump assembly and adapt the large hose from the tank to the 8mm (5/16) fuel feed hose/tube that runs to the fuel filter inlet.

I believe I used two brass pex fittings from lowes (3/8" to 1/2") for the adaptation.

Derek

EDIT: You should figure out why the fuel pumps burnt up in the first place...it may not be the pumps at all, but In my case it was, so I had to do this on my 84 eta.

Ive checked the voltages, fuses and relays and everything checks out. The last 3 weeks when ive gotten the car out i noticed the car didnt prime up with fuel and wouldnt start right away. There was no hum from external pump. Im pretty sure i just finished off the intank pump then considering it couldnt keep up. Was it worth doing what you did in your opinion?

[jlevie]

The major problems with using a late model in-tank high pressure pump in an early (55L) tank is that the late pump does not have a fitting for the fuel return hose and the fuel outlet fitting is smaller. The latter would require some adapters and the former could be solved by using a late production 318is pump.

An E30 does not "prime". The fuel pumps only run when the DME sees timing data from a rotating engine. The pumps may not be burned out. Check the fuel pump relay & fuse 11. And check for spark when cranking the engine. No spark means the DME isn't running or doesn't have timing data, which will mean that the pumps won't run.