1986 sei fuel pump dies when hot


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cfoth
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Joined: Wed May 27, 2015 5:41 am
Location: andover ny
Motorcycle: 1986 GL1200 Aspencade SEI

1986 sei fuel pump dies when hot

Postby cfoth » Thu Jun 11, 2015 7:12 pm



Po installed new (not oem) fuel pump holds 38psi until the bike gets warned up then after awhile it begins to squeal, lose pressure, and bike quits. Honestly can't believe fuel pump being new is bad. Something else must be causing problem



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virgilmobile
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Re: 1986 sei fuel pump dies when hot

Postby virgilmobile » Thu Jun 11, 2015 8:57 pm

Fuel pumps..Yes they are electric and do operate completly submersed in gas.
Gas is actually drawn in all the way through the pump and motor innards.This fuel flow has 2 functions.Lubricate the bearings and keep the pump cool.
Now this is according to factory specs.The pump(or replacement ) must have the correct pressure capability and fuel flow.
Should you put on a 70 psi pump,the pressure regulator should simply dump the excessive pressure back to the tank...but remember..usually higher pressure means less flow or ammount of gas.Even tho the pump works,it may not be circulating enough gas through it to keep it cool.It may be a high pressure pump and the overkill is just trapping the fuel in the pump allowing I to overheat.
You may be able to confirm this theory by pressure testing the pump and comparing it to the requirements of the Wing.If it's too much,another pump may spec closer to the OEM.

cfoth
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Re: 1986 sei fuel pump dies when hot

Postby cfoth » Thu Jun 11, 2015 9:53 pm

My pressure gauge I installed is between the pump and the filter. I assume its reading the pump pressure. I'll check more closely tomorrow. Never thought about what you said makes a lot is sense

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virgilmobile
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Re: 1986 sei fuel pump dies when hot

Postby virgilmobile » Thu Jun 11, 2015 10:32 pm

Off the top of my head,I do not know the specs of the OEM pump...I do know that it's specific on fuel flow..eg..so many oz.per minute...AND can provide this much pressure..whatever that is....If your replacement pump is too far out of range,It may indeed be just not sutable....
From here,If it is a out of spec pump,say a 70 psi one,you don't have many choices...Either modify the fuel system to allow the pump to run at full capacity or replace the pump thats closer to specs....I'd accept a 10% range...Correct pressure and flow are very specific.
Ok..here's the specs...Open discharge...minimum 21.3 ounces in one minute..Engine stopped,key on..fuel pressure should max out at 38PSI..At the injectors....Isn't the regulator on the fuel return line.?
I think the pump drives the fuel injector rails and the excess pressure is then relieved back to the tank by the regulator..

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virgilmobile
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Re: 1986 sei fuel pump dies when hot

Postby virgilmobile » Thu Jun 11, 2015 10:49 pm

I was just reading of a fellow that converted a 1200 carb to efi...
He made this note..
"The pump I used is a Walbro 5CA201, fits 1987-1988 Ford Escort 4 Cyl. 1.9L EFI (VIN J)."... (http://www.ngwclub.com/forum/viewtopic.php?f=47&t=25983 )
The specs seem to be very close to the OEM.

cfoth
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Re: 1986 sei fuel pump dies when hot

Postby cfoth » Fri Jun 12, 2015 4:48 pm

virgilmobile wrote:I was just reading of a fellow that converted a 1200 carb to efi...
He made this note..
"The pump I used is a Walbro 5CA201, fits 1987-1988 Ford Escort 4 Cyl. 1.9L EFI (VIN J)."... (http://www.ngwclub.com/forum/viewtopic.php?f=47&t=25983 )
The specs seem to be very close to the OEM.

the escort pump Is an in tank pump. He listed an Isuzu (I think) external pump. On here I heard to use aprelude pump but when I called the parts store they told new the prelude pump is 70-90 psi
not sure what direction to go

J-P
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Re: 1986 sei fuel pump dies when hot

Postby J-P » Sat Jun 13, 2015 12:59 pm

I'd go with the '85 Honda Prelude fuel pump for carbureted models. Mine works wonderfully, and the Spectra Premium model from Autozone is very reasonably priced. It's discussed here: viewtopic.php?t=9459. Here's a link to the product information: http://www.autozone.com/1/products/4309 ... 259ep.html. It's not difficult to install. Almost plug and play.

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Re: 1986 sei fuel pump dies when hot

Postby J-P » Sat Jun 13, 2015 1:19 pm

Please disregard the earlier post. I didn't realize yours is fuel injected.




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