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M20 fuel delivery


Guest Anonymous

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Guest Anonymous

URL: http://catalog.alloembmwparts.com/?year=1991&make=BM&search_button23.x=33&search_button23.y=11

This is s question for you M20 guys. I'm starting in on my M20 conversion and while I'm waiting for the right motor I want to set up my fuel delivery. I've seen a lot of talk about using a fuel pump from an 1990-91 E30 318is or Cab in tank. I've added the link. Will this provide enough fuel pressure? Or will I need to have the stock E30 pre-pump and regular pump? The other question is, if the in tank works who's seen them at the pick n pull? I've been combing the pick n pulls in the East Bay and haven't seen any at all.

TIA,

evan

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Guest Anonymous

sorry the link doesn't go to the specific page.

here's the specific category: Vehicle: 1991 BMW 318is Coupe

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Guest Anonymous

Hey Evan, I run a pre in tank pump from a 320i and then a 325i convt main pump. I thought the intank was worthless cuz i have starvation problems but i disconnected it and cant give it full throttle without it; it just surges. With the two of them, it never has fuel problems until hard cornering in 1/4 or less fuel left. Anyone else have that problem? Let me know if I can help.

Curtis

Orlando, FL

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Guest Anonymous

You do not need two pumps, for the 85/90 M20(L/LE-Jetronic, Motronic)a single original external pump will supply 2.5/3.0 bar and flow at 1.4 litre/min.

Later M20 91/92 (Motronic 3.1) an intank pump was fitted to supply 4 bar at 2 litre/min.

E36 91/92 316i/318i (Motronic M1.7) as above.

You can also fit a pump from a 5 series M20 again check which ECU its using, infact many vehicles run jetronic so any of these external pumps can fitted, for intank pumps they tend to be vehicle specific.

And if your going to use secondhand pumps invest in a cheap liquid pressure gauge and fit it to the press.regulator this will check your operating pressure (easy/cheap fault finding tool)

Your not short of options, Good luck

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Guest Anonymous

A regulator would be a good idea for sure. I didn't realize that I don't

need to prepump. Excellent. Those external fuel pumps are readily

available at the pick n pull.

Thanks again,

Evan

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Guest Anonymous

hmmm... that's definitely a problem to have fuel starvation on 1/4 tank

in cornering. do you know what the other M20 crew are running and if

they have the same problem? tom miller who is some what of a BMW

guru in the Bay Area once told me that I could use the in-tank fuel

pump from an 1990-91 e30 and it would give me more than adequate

fuel pressure. have you heard of this? the problem is, is that in the

last few months i have yet to come across one at the pick n pull and i'd

rather not spend $200 on a new one. it would be supa easy if that's all

it took though.

i've read about the 320i prepump and 325i main pump set up like the

one you are running. on a scale of one to ten how would you rate it?

thanks for the advice.

evan

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