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In tank fuel pump substitute for M35

2deuce

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portland, oregon
I've seen the price of original pumps, and wondered if there was some work around that didn't empty the wallet. They certainly went up in price since I bought my last one.
What pressure and volume did the original put out?
Thanks
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
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Mason, TN
I've seen the price of original pumps, and wondered if there was some work around that didn't empty the wallet. They certainly went up in price since I bought my last one.
What pressure and volume did the original put out?
Thanks
I use a 24v Carter vane pump mounted on the firewall in the engine bay. gut the old pump and put a pickup hose on it In the tank.

P4603hD
 

biscuitwhistler37

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Michigan
I've read people have used 24v Walbro in tank marine pumps with success, a bit pricier than some but still half price of an original pump. I really like simps idea though, hard to foul a pump out if it's not in the constant fouling grossness that is the deuce fuel cell.
 

2deuce

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Location
portland, oregon
I looked in the tank, and it looks surprisingly clean, it is a 1987 truck, so it's not as old as some. If I remember right I think the pump runs slowly, and makes a lot of noise doing so, but doesn't pump anything. How are they resurrected?
 

KN6KXR

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Felton, CA
Pull the pump and check it out. Mine was filthy but even after cleaning would only run upside down. Since it's really hard to drive the truck that way I needed a new one.

Honestly the stock pump is a crappy design. Why replace it with the same junk? I installed a Walbro for half the price and haven't looked back. Actually I scored it on eBay for like $50 so there's a place to look for a deal. Heck the hoses and fittings cost more (I upgraded to a premium modern hose instead of the hard lines). A good marine diesel pump like the Walbro will last a really long time. The stock one not so much.
 
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fsearls92

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International Falls, MN
Pull the pump and check it out. Mine was filthy but even after cleaning would only run upside down. Since it's really hard to drive the truck that way I needed a new one.

Honestly the stock pump is a shit design. Why replace it with the same junk? I installed a Walbro for half the price and haven't looked back. Actually I scored it on eBay for like $50 so there's a place to look for a deal. Heck the hoses and fittings cost more (I upgraded to a premium modern hose instead of the hard lines). A good marine diesel pump like the Walbro will last a really long time. The stock one not so much.

This is funny, as the original pumps have been in trucks for 50 plus years. Walbro on their site says their pumps will only last 10-20 years.
 
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msgjd

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upstate ny
somewhere in another thread on here is the actual psi and flow data on the OEM in-tank pump .. IIRC, it is miniscule psi, something like 2 or 3 but is not more than 5 or 6.. On a couple of mine I use a 24v carter inline pump with 10-12psi with no issue for several years, and wired with the in-tank wire..

The multifuels will start and run just fine with an inop pump as long as they don't lose prime.. If they run every day or two you likely will never know the pump is bad.. I can tell you an operational in-tank pump helps immensely with starting a truck that has sat awhile or has an air leak somewhere.. The difference can be cranking 30 seconds before it fires (or fails), versus it firing right up within a second or two
 

Jeepsinker

Well-known member
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Dry Creek, Louisiana
somewhere in another thread on here is the actual psi and flow data on the OEM in-tank pump .. IIRC, it is miniscule psi, something like 2 or 3 but is not more than 5 or 6.. On a couple of mine I use a 24v carter inline pump with 10-12psi with no issue for several years, and wired with the in-tank wire..

The multifuels will start and run just fine with an inop pump as long as they don't lose prime.. If they run every day or two you likely will never know the pump is bad.. I can tell you an operational in-tank pump helps immensely with starting a truck that has sat awhile or has an air leak somewhere.. The difference can be cranking 30 seconds before it fires (or fails), versus it firing right up within a second or two
Yeah, pressure requirement is 4-7 psi, but the volume at that pressure is most important. I'm not familiar with the pump you used, but with 3× the required pressure it likely provides enough volume for proper hydraulic head cooling as well. I see a lot of people use little clicker pumps with 1/4" NPT inlet and outlet, and they just don't understand that it doesn't provide enough volume even if it does supply enough pressure. Can't flow the same volume through a 1/4" and a 1/2" pump at the same pressure.
 

msgjd

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upstate ny
... I see a lot of people use little clicker pumps with 1/4" NPT inlet and outlet, and they just don't understand that it doesn't provide enough volume even if it does supply enough pressure.
correct! the carter pumps i used are 3/8 flow-thru's so-that the fuel will draw even if fuel pump fails
 
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