get to ½ tank gas and '88GW will stall

For everything related to using Fuel Injection in an FSJ.
Mikel
Posts: 19
Joined: Mon Mar 25, 2013 6:26 pm
Location: CT

Re: get to ½ tank gas and '88GW will stall

Postby Mikel » Sun Apr 07, 2019 5:55 pm

What about a buffer tank after the pump?

The tank would have a considerable internal volume and both the inlet and outlet would be at the bottom. When pressurized, the internal air would act as a spring, providing fuel pressure for short periods while the pump is sucking air.

The only problem I see is with longer fuel system priming times. But I bet a check valve would shorten that time...

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acct21
Posts: 213
Joined: Sun Jan 05, 2014 1:32 pm

Re: get to ½ tank gas and '88GW will stall

Postby acct21 » Thu Apr 11, 2019 12:10 am

You referring to a surge tank? I run a surge tank on mine -- it's installed under the hood where the charcoal canister used to sit. It's about a quart in capacity, and is fed by the low-pressure stock fuel system and mechanical pump. The high-pressure pump for my EFI is submerged in the can. Unless I completely empty the gas tank, any fuel in the surge tank will continue to feed the EFI -- even if the pickup tube in the tank is temporarily exposed due to fuel slosh.
1990 GW with HD towing package -- everything works! (today, anyway)

Mikel
Posts: 19
Joined: Mon Mar 25, 2013 6:26 pm
Location: CT

Re: get to ½ tank gas and '88GW will stall

Postby Mikel » Thu Apr 11, 2019 7:03 am

Not exactly. Mine would use air pressure. But your approach sounds interesting.
Thanks.

RamJetFSJ
Posts: 284
Joined: Fri Mar 22, 2013 12:36 pm
Location: Carpinteria, CA

Re: get to ½ tank gas and '88GW will stall

Postby RamJetFSJ » Thu Apr 11, 2019 7:24 am

Note that you must use fuel hole designed for full fuel submersion inside your tank. Otherwise it will fail in a short time! Regular fuel hose is not OK.
80 Wag in 73 attire, Ram Jet 350 power

1979bettywhite
Posts: 457
Joined: Tue Jul 25, 2017 8:14 am

Re: get to ½ tank gas and '88GW will stall

Postby 1979bettywhite » Fri Apr 12, 2019 11:45 am

Yep, ordered up the exact same setup that Acct did for his. Same sock, and some submersible fuel line and stainless clamps. Plan to rent a flaring tool tomorrow, drop the tank and swap things out.

Anyone have decent instructions on how to calibrate your sending unit? I have an aftermarket poly tank for my 78 that has a separate sending and pickup. Fuel gauge reads 3/4 when I fill it up.

RamJetFSJ
Posts: 284
Joined: Fri Mar 22, 2013 12:36 pm
Location: Carpinteria, CA

Re: get to ½ tank gas and '88GW will stall

Postby RamJetFSJ » Fri Apr 12, 2019 12:00 pm

All you can really do is bend the wire that the float is on to get it to show the biggest range of fullness. Problem is, if you bend it to show F when full, you may run out of gas at 1/4 tank gauge reading.
80 Wag in 73 attire, Ram Jet 350 power

1979bettywhite
Posts: 457
Joined: Tue Jul 25, 2017 8:14 am

Re: get to ½ tank gas and '88GW will stall

Postby 1979bettywhite » Fri Apr 12, 2019 12:53 pm

I'm hoping this fix to get the sock to the bottom of the tank will help out with that. Nothing I can do to solve the fuel slosh problem though.

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acct21
Posts: 213
Joined: Sun Jan 05, 2014 1:32 pm

Re: get to ½ tank gas and '88GW will stall

Postby acct21 » Tue Apr 16, 2019 11:09 am

1979bettywhite wrote:I'm hoping this fix to get the sock to the bottom of the tank will help out with that. Nothing I can do to solve the fuel slosh problem though.


Pull your electric pump, replace your mechanical pump, and install a surge tank with an internal high-pressure pump. If you have a slosh/cavitation problem, it will be solved.
1990 GW with HD towing package -- everything works! (today, anyway)

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acct21
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Re: get to ½ tank gas and '88GW will stall

Postby acct21 » Tue Apr 16, 2019 11:10 am

Though I suspect that getting your pickup down to the actual bottom of the tank is going to help things tremendously.
1990 GW with HD towing package -- everything works! (today, anyway)

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tedlovesjeeps71
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Joined: Fri Jul 22, 2016 4:39 pm

Re: get to ½ tank gas and '88GW will stall

Postby tedlovesjeeps71 » Tue Apr 16, 2019 12:03 pm

acct21 wrote:Though I suspect that getting your pickup down to the actual bottom of the tank is going to help things tremendously.

It did with mine.


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