Anyone have a 62 tank into a 60 with a TBI Chevy Motor? (1 Viewer)

[DrivingMissRosey]

Hi Everyone,
I'm continuing to have problems with a fuel pump on the frame rail (Mallory 4060FI for the 350SBC TBI), so I'm thinking about doing a conversion that puts in a 62 tank with the stock GM in-tank fuel pump and sending unit. I've only heard that this conversion can be done, but never seen it done.

Is this possible? Has anyone done this? If so, do you have a parts list? Any major things I need to be aware of?

Thanks,
Nick

 

[torfab]

The 62 pump puts out too much pressure for a tbi system, so you will need to step it down to 15psi from the factory 70psi. I would try a different pump before switching tanks

 

[Elbert]

get a walbro fuel pump.

 

[dallen341]

The Chevy TBI has an internal regulator with return line to the tank. WIll the TBI not just regulate the higher feed pressure of the 62 series pump?

 

[lehiguy]

It seems odd that you are having trouble, my setup is just like yours (different pump) I have never had a single issue and I have run it down to fumes more than once.

 

[torfab]

The chevy tbi fuel regulator is designed to regulate a 15psi flow. Feeding it 70psi from the toyota pump will likely cause failure.

 

[ntsqd]

I don't know about 70 psi, but I have read of folks using TPI fuel pumps (~50psi) with TBI systems. The plumbing connections are more of an issue than the regulator (hose clamps are very iffy). That the regulator could fail from excessive pressure I don't discount, but assuming that the regulator and return line can flow enough volume 70psi doesn't seem like it should be a problem.

 

[DrivingMissRosey]

The reason I'm thinking about going to an in-tank pump is that for work, I oftentimes do multi-day cross country trips a year and a pump that is cooled by the gasoline in the tank would likely be better. Heres whats happening: right now I'm working in NM and due to the high ambient temps, I the pump is getting really hot, as is the gasoline, and then I end up with a pump that is refusing to push gas. I know this sounds like vapor lock, but the pump is shutting off I promise. I'm pretty sure that the pump is drawing lots of current and then shorting out until it cools down. I've already blown a fuse just two days ago. Plus, after running it in the heat for a while I get a gas smell in the cabin, like the carbon filter for the tank is getting too much vapor from the tank. Plus yesterday when the pump stopped pumping after the climb out of Broomfield into Aztec, I pulled over and in addition to the total lack of pump sound there was a gurgling sound from the tank. I pulled off the cap and gas came spurting out (it was only half full though). I put my finger down the filler hole and it was really, really warm down in there. I'm thinking an in-tank pump would a) keep the pump cooler which would keep the gas temp down and b) just be more reliable.

And about the PSI issue, I think it was Proffitts that told me to use a 62 tank because then you can use the GM sending unit and pump in the tank. I'm thinking that since I have a GM motor, its better to send the fuel with what is supposed to be there anyway.

 

[Kurtis]

How do you have your filters setup? Heat shoud not be an issue for you. I run mine in the 110-118 days we've been having in az with the a/c on sitting in traffic. I run a walbro gsl 395 or something pump. Regular filter before pump and high pressure after. The pump is mounted as close as feasible to the tank slightly below it. 15k+ miles and two years. Long trips, commuting, and off road.
Not having the filters in the right order will kill them fast. I want to say a few other people on here have had problems with holley's.
If it were me I would replace it with a walbro and keep the holley for backup and your better off than switching to an intank as far as worrying about getting stranded. Plus a walbro is only around 135$ if I remember. Its not really very loud either.

 

[lehiguy]

You have a problem of a different nature. That much pressure in the tank is not right and I would bet the farm that it's causing the pump to overload due to the fact that it cannot push the fuel back into the tank through the return line. If you have removed the Cruiser's charcoal canister as part of your motor swap, this is likely the problem. For the TBI motors GM used a simple canister with one line to the tank (use the one that's already there), one line is fresh air in (filter that) one goes to the base of the TB to purge it. I adapted one of these into my system, it works flawlessly and I never have tank pressure. I have done long trips in the 100 plus degree weather too. Malory makes a good product and if it hasn't been cooked due to this condition, I would keep it.

 

[DrivingMissRosey]

How do you have your filters setup? Heat shoud not be an issue for you. I run mine in the 110-118 days we've been having in az with the a/c on sitting in traffic. I run a walbro gsl 395 or something pump. Regular filter before pump and high pressure after. The pump is mounted as close as feasible to the tank slightly below it. 15k+ miles and two years. Long trips, commuting, and off road.
Not having the filters in the right order will kill them fast. I want to say a few other people on here have had problems with holley's.
If it were me I would replace it with a walbro and keep the holley for backup and your better off than switching to an intank as far as worrying about getting stranded. Plus a walbro is only around 135$ if I remember. Its not really very loud either.

I'm gonna check the filter set-up tonight when it cools down.

As far as the Walbro unit, lots of people have been recommending it to me. If this Mallory unit is kaput, I'm going to that one if the in-tank setup isn't a go.

 

[DrivingMissRosey]

You have a problem of a different nature. That much pressure in the tank is not right and I would bet the farm that it's causing the pump to overload due to the fact that it cannot push the fuel back into the tank through the return line. If you have removed the Cruiser's charcoal canister as part of your motor swap, this is likely the problem. For the TBI motors GM used a simple canister with one line to the tank (use the one that's already there), one line is fresh air in (filter that) one goes to the base of the TB to purge it. I adapted one of these into my system, it works flawlessly and I never have tank pressure. I have done long trips in the 100 plus degree weather too. Malory makes a good product and if it hasn't been cooked due to this condition, I would keep it.

I have the stock gm charcoal canister on there. I'll check to make sure everything is hooked up right and breathing easy when the temp drops this afternoon.

 

[DrivingMissRosey]

The 62 pump puts out too much pressure for a tbi system, so you will need to step it down to 15psi from the factory 70psi. I would try a different pump before switching tanks

I was thinking of putting the OE GM pump and sending unit into the 62 tank. Has anyone done this?

 

[xxfullsailxx]

i am running a chevy tbi off of the stock 62 in-tank pump ('88 toyota FJ62-350TBI/700R4). i was told (from toyota service tech) that the pump pressure was only ~40 psi. i have yet to have any fuel issues but my gas mileage is crappy...less that 10 MPG in town. i guess i've been wondering if it's running rich due to the excessive pressure. i have not installed the charcoal canister yet either.

when i was looking into the swap i was thinking about doing the same thing with the GM pump. my understanding is that you may have to fabricate an adapter ring to mount the GM pump to the toyota tank ring. i had spoke to Colorado Toyota Specialists and i believe this is the set up they run. you may want to call them.

 

[lehiguy]

i am running a chevy tbi off of the stock 62 in-tank pump ('88 toyota FJ62-350TBI/700R4). i was told (from toyota service tech) that the pump pressure was only ~40 psi. i have yet to have any fuel issues but my gas mileage is ****py...less that 10 MPG in town. i guess i've been wondering if it's running rich due to the excessive pressure. i have not installed the charcoal canister yet either.

when i was looking into the swap i was thinking about doing the same thing with the GM pump. my understanding is that you may have to fabricate an adapter ring to mount the GM pump to the toyota tank ring. i had spoke to Colorado Toyota Specialists and i believe this is the set up they run. you may want to call them.

There cannot be excessive pressure since the pressure regulator in the throttle body will "blow open" at 13 PSI or less. The pump's capability is completly irrelevant once that regulator is open.

 

[ntsqd]

That is completely true so long as the return system can flow enough to have no pressure in it. Any back-pressure in the return system will 'adjust' the injector pressure upwards by nearly the same amount. I don't think that this is commonly known. Seems like in a lot of cases not much effort gets put into building a high flow return system.

 

[lehiguy]

You should have a very open conversation with your return line. Sounds like it's hiding something from you, like a possible extra-marital relationship with debris or other restriction-forming junk. Having gas spew out of your tank is completly off the charts for reasonable operation.

 

[Elbert]

the easy solution is to get a walbro external fuel pump that is appropriate for TBI. I've been running a walbro external pump (the same one) since I did my engine swap. Rover67 has a write up on setting up an intake fuel pump if thats what you want to do.

 

[Kurtis]

10mpg sounds pretty low. Even on 35s SOA with an auto I get 13-14 around town 15-17 on the highway depending on speed. Have you driven around with a scaner hooked up to make sure its going from open to closed loop correctly?

 

[DrivingMissRosey]

You should have a very open conversation with your return line. Sounds like it's hiding something from you, like a possible extra-marital relationship with debris or other restriction-forming junk. Having gas spew out of your tank is completly off the charts for reasonable operation.

And the fumes and inside of the filler neck were quite warm to the touch. It was hot outside so it might be just the ambient temp. I checked it because there was a wooshing sound every few seconds from around the cap. When I undid the cap, then it spewed out a few tablespoons of gas.