Sand in the pump. Replaced the pump. The pee port was plugged & the hose . Cleaned and it blows through nice, still low flow. I And Im getting water in the crank shaft tube not the gear housing . I took off lower end and put my house water hose to the water tube and and the flow is still the same. The water shoots out about 1' 1/2, but its a thin week spray . Not a strong solid spray the hits the water like it used to. Could the exhaust chamber to the t-stat get clogged?